Author name code: testerman
ADS astronomy entries on 2022-09-14
author:"Testerman, L." 
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Title: Fourier Transform Spectrometer Observations of Solar Carbon
    Monoxide. II. Simultaneous Cospatial Measurements of the Fundamental
    and First-Overtone Bands, and CA II K, in Quiet and Active Regions
Authors: Ayres, T. R.; Testerman, L.; Brault, J. W.
Bibcode: 1986ApJ...304..542A
Altcode:
  Fourier transform spectrometry has yielded simultaneous cospatial
  measurements of important diagnostics of thermal structure in the high
  solar photosphere and low chromosphere. It is noted that the anomalous
  behavior of the fundamental bands of CO in quiet areas near the limb is
  accentuated in an active region plage observed close to the limb. The
  difference between the core temperatures of the CO fundamental bands
  in a plage and a nearby quiet region at the limb is larger than the
  corresponding brightness temperature differences in the inner wings
  of the Ca II line measured in a quiet region and several plages
  closer to the disk center. Numerical simulations indicate that the
  disparate behavior of the CO bands with respect to Ca II K cannot be
  reconciled with existing single component thermal structure models;
  a two-component atmosphere is required.

Title: Book-Review - Solar Flux Atlas from 296 TO 1300-NM
Authors: Kurucz, R. L.; Furenlid, I.; Brault, J.; Testerman, L.
Bibcode: 1985S&T....70...38K
Altcode:
  No abstract at ADS

Title: Solar flux atlas from 296 to 1300 nm
Authors: Kurucz, Robert L.; Furenlid, Ingemar; Brault, James;
   Testerman, Larry
Bibcode: 1984sfat.book.....K
Altcode:
  No abstract at ADS

Title: Absolute oscillator strengths for lines of neutral cobalt
    between 2276 A and 9357 A and a redetermination of the solar cobalt
    abundance
Authors: Cardon, B. L.; Smith, P. L.; Scalo, J. M.; Testerman, L.;
   Whaling, W.
Bibcode: 1982ApJ...260..395C
Altcode:
  Absolute oscillator strengths of neutral cobalt have been
  determined from hook measurements for 159 transitions and emission
  intensity measurements for 314 transitions between 2276 Å and 9357
  Å. Ninety-five of these transitions were subjected to the procedure
  developed by Cardon, Smith, and Whaling which fits combined absorption
  and emission data to a set of consistent, optimum, relative oscillator
  strengths and upper level lifetimes. These relative values were
  normalized to the radiative lifetimes of Figger et al. and of Marek
  and Vogt obtained by pulsed laser fluorescence. Absolute oscillator
  strengths for 362 transitions and 36 lifetimes were determined. Typical
  uncertainties in the reported absolute oscillator strengths are ±15-25%
  (2/3 confidence level). <P />Equivalent widths were obtained for
  nineteen solar cobalt lines with the McMath solar telescope at Kitt
  Peak National Observatory. These widths were used to redetermine the
  solar cobalt abundance, assuming the photospheric model of Holweger
  and a microturbulence velocity of 1.0 km s<SUP>-1</SUP>. The adopted
  solar cobalt abundance is the mean value log Co/N<SUB>H</SUB>&gt; + 12 =
  4.92 ± 0.08 (±19%), from the 19 cobalt transitions. This value is in
  excellent agreement with the solar values of Ross and Aller, of Biemont,
  and of Holweger and that of Cameron for carbonaceous chondrites.

Title: Infrared bands of C2 in the solar photospheric spectrum
Authors: Brault, J. W.; Testerman, L.; Grevesse, N.; Sauval, A. J.;
   Delbouille, L.; Roland, G.
Bibcode: 1982A&A...108..201B
Altcode:
  Lines of the C<SUB>2</SUB> Phillips system have been successfully
  searched for on new tracings of high resolution solar spectra. From a
  rather large number of lines of the (0,0), (1,0), and (0, 1) bands,
  we derive empirical values for the band oscillator strengths:
  f<SUB>00</SUB> = 1.41 10<SUP>-3</SUP>, f<SUB>10</SUB> = 1.38
  10<SUP>-3</SUP>, and f<SUB>01</SUB> = 1.12 10<SUP>-3</SUP>. These
  solar f-values are discussed in section 3.1 and compared with recent
  laboratory data. <P />For the Ballik-Ramsay system, only a few
  unblended solar lines have been available, from which we deduced 0.6
  10<SUP>-3</SUP> ≪ f<SUB>00</SUB> ≪ 1.2 10<SUP>-3</SUP>.

Title: Fourier Transform Spectrometer observations of solar carbon
    monoxide. I - The fundamental and first overtone bands in the
    quiet sun
Authors: Ayres, T. R.; Testerman, L.
Bibcode: 1981ApJ...245.1124A
Altcode:
  Measurements of the 2200/cm fundamental and 4300/cm first overtone
  vibration-rotation band systems of solar carbon monoxide, were obtained
  with the Fourier Transform Spectrometer of the McMath telescope at
  Kitt Peak. The overtone measurements were taken at the east, north,
  and west heliocentric limbs, and at disk center. Observations of the
  strong fundamental bands were obtained at disk center and near the
  north limb. The low core brightness temperatures of the strongest
  fundamental carbon monoxide lines near the limb, reported previously
  by Noyes (1972) and Hall (1974), are confirmed. The possibility that
  thermal inhomogeneities might be responsible for the unusual behavior of
  the fundamental carbon dioxide lines have been examined. The somewhat
  discordant behavior of the fundamental lines at disk center compared
  with the north limb seems to favor a limb shadowing effect. The
  first overtone limb equivalent widths and the best-fit thermal and
  microvelocity models indicate a solar carbon abundance of 0.004 (on
  the scale with A<SUB>H</SUB> = 1) for an oxygen-to-carbon abundance
  ratio of 2.

Title: Thermal Bifurcation in Solar Calcium Plages
Authors: Ayres, T. R.; Linsky, J. L.; Testerman, L.; Brault, J.
Bibcode: 1981BAAS...13..915A
Altcode:
  No abstract at ADS

Title: Quadrupole transitions of the 1&lt;-0 band of N<SUB>2</SUB>
    observed in a high resolution atmospheric spectrum.
Authors: Camy-Peyret, C.; Flaud, J. -M.; Delbouille, L.; Roland, G.;
   Brault, J. W.; Testerman, L.
Bibcode: 1981JPhys..42L.279C
Altcode:
  No abstract at ADS

Title: Applications of Kitt Peak's One-Meter Fourier Transform
    Spectrometer
Authors: Testerman, L.; Hubbard, R.
Bibcode: 1980BAAS...12..916T
Altcode:
  No abstract at ADS

Title: KPNO FTS Measurements of the Fundamental and First Overtone
    Bands of Solar Carbon Monoxide
Authors: Ayers, T. R.; Testerman, L.
Bibcode: 1979BAAS...11..732A
Altcode:
  No abstract at ADS

Title: Motions in the Atmosphere of Alpha Orionis
Authors: Goldberg, L.; Testerman, L.; Willmarth, D.
Bibcode: 1979BAAS...11..682G
Altcode:
  No abstract at ADS

Title: The center-to-limb behavior of Ca  i λ6573 and [Ca  ii] λ7324
Authors: Ayres, T. R.; Testerman, L.
Bibcode: 1978SoPh...60...19A
Altcode: 1978SoPh...60...19.
  Center-to-limb measurements of the Ca I λ6573 intercombination line and
  the Ca II λ7324 forbidden line are compared with synthetic profiles
  based on a simple representation of the non-LTE Ca-Ca<SUP>+</SUP>
  ionization equilibrium. The effects of photoionizations from low
  lying excited states of neutral calcium are found to reduce the
  sensitivity of the λ6573 center-to-limb behavior as a thermal structure
  diagnostic. The synthetic center-to-limb behavior is also sensitive to
  uncertainties in the nonthermal broadening. Nevertheless, the measured
  center-to-limb behavior of λ6573 favors a `cool' photospheric model
  similar to the Vernazza, Avrett, and Loeser model M over hotter models
  based on the Ca II K wings. The non-LTE calcium abundance obtained
  from the disk center equivalent widths of λ6573 and λ7324 using
  the best fit model is A<SUB>Ca</SUB>≅2.1±0.2 × 10<SUP>-6</SUP>
  (by number relative to hydrogen). Applications of these lines as
  diagnostics of the Ca-Ca<SUP>+</SUP> ionization equilibrium in other
  stars are briefly discussed.

Title: Transition probabilities in Ti I and the solar titanium
    abundance.
Authors: Whaling, W.; Scalo, J. M.; Testerman, L.
Bibcode: 1977ApJ...212..581W
Altcode:
  Branching ratios have been measured for 103 lines from 14 levels in
  Ti I, and absolute transition probabilities have been determined by
  combining these branching ratios with the radiative lifetimes measured
  by Roberts, Sorensen, and Andersen (1973) by the beam-foil method. The
  solar equivalent width at the disk center has been measured for 23 of
  these lines on the preliminary edition of the Kitt Peak Solar Atlas. The
  solar Ti abundance has been computed by matching the equivalent widths
  of 15 of the weakest lines and by fitting the profiles of 16 lines. The
  two methods yield an average photospheric abundance log (N(Ti)/N(H))
  + 12 = 4.98 plus or minus 0.15 based on the HSRA solar model.

Title: Applications of Fourier analysis to broadening of stellar
    line profiles. III. Solar microturbulence and macroturbulence from
    iron lines.
Authors: Smith, M. A.; Testerman, L.; Evans, J. C.
Bibcode: 1976ApJ...207..308S
Altcode:
  Kitt Peak solar profiles of iron lines obtained at = 0.63 have been
  utilized to study the solar velocity field. The high quality of these
  data and the lack of influence of rotation make possible a modeling of
  the macroturbulent velocity distribution as well as a determination of
  the micro- turbulence. The analysis was performed by matching computed
  and observed criteria in both the wavelength and the Fourier transform
  domains. The principal ambiguities in evaluating microturbulence are
  caused by the uncertainty in the functional form of macroturbulence
  and in the value of the atomic damping constants. The form of the first
  sidelobe in the data transfbrms indicates the existence of a low (k +
  41 km s-1) micro- turbulence at intermediate photo spheric regions which
  increases toward larger depths. Attempts were made to fit profiles
  with macroturbulences of a wide variety of functional forms. In the
  wavelength representation the Voigt distribution gives the best overall
  fit, whereas in the transform domain an exponential function matches
  the observed sidelobe best. A comparison of all the results (Table 2)
  shows only a small disparity in best-fit parameters around a mean of
  2.0 km 1 A triangular macrovelocity distribution which is similar to
  that predicted by a radial-tangential model is recovered explicitly by
  deconvolution. However, for practical reasons a good one-parameter fit
  to it is provided by the exponential function. Because this function
  is very dissimilar to the rotation function, it should be possible
  to evaluate macroturbulence and rotation separately in sharp-lined
  late-type stars. Subject headings: line profiles - Sun: atmospheric
  motions - Sun: spectra

Title: The Ability of Current Micro-Velocity Models to Represent
    Center-Limb Line Profiles
Authors: Evans, J. C.; Testerman, L.
Bibcode: 1975SoPh...45...41E
Altcode:
  We present results on the ability of microturbulence, LTE line
  formation, and a homogeneous thermal model to realistically
  represent the center-limb variation of temporally and spacially
  averaged solar line profiles. We have used three somewhat similar
  semi-empirical thermal models in combination with five current
  microturbulence models which cover the gamut of homogeneous-isotropic to
  nonhomogeneous-anisotropic. From high resolution photoelectric data for
  λ λ5000-6000 at five μ-values (1, 0.63, 0.4, 0.25, 0.16) obtained
  at KPNO, we selected 17 Fe I and 5 Fe II line profiles to unblend
  and symmetrize for study. An iterative scheme has been developed to
  calculate theoretical profiles for the various combination of models and
  compare them to the observed profile using the abundance at each limb
  position and the magnitude of the pressure broadening at the center
  of the disc as parameters. We find that a microturbulence model, for
  which the radial and tangential components increase into deeper layers
  with ξ<SUB>tan</SUB>&gt;ξ<SUB>rad</SUB>, produces a reasonable good
  center-limb fit for lines less than 100 mÅ. However, for lines stronger
  than 140 mÅ, microturbulence models with no depth dependence produce
  the best match between theory and observation. Thus, there is reason
  to question the uniqueness of the microturbulence concept.

Title: Five-Minute Oscillations of Solar Equivalent Widths
Authors: Holweger, H.; Testerman, L.
Bibcode: 1975SoPh...43..271H
Altcode:
  Equivalent widths of weak and moderately strong Fraunhofer lines
  observed in an area roughly 3500 × 10000 km in extent are found
  to show small variations of the order of 1 mÅ, on a time scale of
  minutes. The dependence of amplitude on line strength and excitation
  closely fits that predicted for a compressional disturbance associated
  with temperature variations that manifest themselves in the equivalent
  widths. The rms amplitude is about 20K near τ<SUB>5000</SUB> =
  10<SUP>-2</SUP>.

Title: Macroturbulence broadening of solar lines with implications
    for stellar studies.
Authors: Evans, J. C.; Ramsey, L. W.; Testerman, L.
Bibcode: 1975A&A....42..237E
Altcode:
  This paper reports results of numerical studies of macroturbulence
  broadening on solar LTE intensity profiles with a view toward applying
  the results toward other solar-type stars. The results are compared
  for five different velocity models with spatially and temporally
  averaged center-to-limb observations. The comparisons are made through
  the curve of the line-width correlation and through the curve of the
  line-shape diagram. For mildly saturated lines (about 120 mA), the
  solar macrovelocities are the most important of the velocity scale
  sizes in determining the shape of the line core. The unsaturated weak
  lines and the curve of the line-width correlation do not discriminate
  between the two scale sizes of broadening, as suggested by other
  studies. High-accuracy photoelectric data for Procyon used in the curve
  of the line-shape indicates that macroturbulence broadening dominates
  and that the microturbulence component is about 1 km/s.

Title: High-resolution profiles of sodium and potassium lines in
    Alpha Orionis.
Authors: Goldberg, L.; Ramsey, L.; Testerman, L.; Carbon, D.
Bibcode: 1975ApJ...199..427G
Altcode:
  Profiles of the K I resonance line at 7698.98 A and of the D1
  and D2 lines of Nai in the spectrum of a Ori have been recorded
  photoelectrically using the main beam of the McMath solar telescope
  at KPNO. The Na lines were observed in the fourth order of the
  spectrograph and the K iline in the third order, providing a resolving
  power of approximately 50 mA. The observed profiles are consistent with
  a model in which radiation from the stellar photo sphere is scattered
  and reemitted by an expanding envelope or envelopes of radius large
  compared with that of the photosphere. Each blueshifted absorption
  core appears to consist of two components of approximately the same
  intensity. The first has a heliocentric radial velocity of + 11-13 km ,
  which agrees very well with measurements of other resonance lines by
  other observers, whereas the second is in the range + 6 km 1 and appears
  not to have been detected previously. Subject headings: circumstellar
  shells - late-type stars - stellar winds - stars, individual

Title: Ni I transition probabilities and the solar nickel abundance.
Authors: Lennard, W. N.; Whaling, W.; Scalo, J. M.; Testerman, L.
Bibcode: 1975ApJ...197..517L
Altcode:
  Absolute transition probabilities have been measured for 97 lines from
  11 levels in Ni I using the beam-foil lifetime and branching-ratio
  technique. We have measured equivalent widths at the disk center
  from the Preliminary Edition of the Kitt Peak Solar Atlas for 49
  of the above lines. An empirical solar curve of growth has been
  constructed to test the consistency of the transition probabilities
  and equivalent widths. The solar Ni abundance has been computed (1)
  by matching the equivalent widths of the 10 weakest lines, and (2) by
  fitting the profiles of 19 lines. Both methods agree within experimental
  uncertainty and yield an average photospheric Ni abundance of 6.28 +
  0.09. Subject headings: abundances, solar - transition probabilities

Title: High Resolution Profiles of Sodium and Potassium Lines in
    α Orionis.
Authors: Goldberg, L.; Ramsey, L.; Testerman, L.; Carbon, D.
Bibcode: 1975BAAS....7..233G
Altcode:
  No abstract at ADS

Title: An Abundance Analysis by Center and Limb Profile Fitting
Authors: Testerman, Larry
Bibcode: 1974BAAS....6R.295T
Altcode:
  No abstract at ADS

Title: Center-Limb Velocity Broadened Profiles.
Authors: Testerman, L. K.; Evans, J. C.
Bibcode: 1973BAAS....5..445T
Altcode:
  No abstract at ADS

