J/ApJ/408/305 Cat of Stellar Lyman-Alpha Fluxes (Landsman, Simon 1993)
A catalog of stellar Lyman-alpha fluxes
LANDSMAN W.B. , SIMON T.
<Astrophys. J. 408, 305 (1993)>
=1993ApJ...408..305L 1993ApJ...408..305L
ADC_Keywords: Stars, emission - 840, Photometry, hydrogen line - 525
Abstract:
The data file gives the measured Lyman alpha flux or upper limits for
275 stars as derived from IUE spectra. The file is a subset of Table 1
of Landsman and Simon in that when a star had multiple measurements,
only the best measurement is included in this table. The spectral
types, V and B-V magnitudes in the table are culled from various
sources as described in the paper. Most of the measurements are
derived from low-dispersion spectra, and those derived from
high-dispersion spectra are flagged. Each measurement was assigned
a data quality code according to the signal to noise after removal
of the diffuse Lyman alpha background emission.
-1 - upper limit
1 - good quality
2 - fair quality
3 - poor quality
4 - contains saturated pixels
The final column gives the ratio of the Ly alpha flux to the total
bolometric flux of the star, determined as described in the paper.
A roundoff was applied to the fluxes listed here to give the fluxes
listed in Table 1 of Landsman and Simon.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 80 275 Lyman-alpha fluxes
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Byte-per-byte Description of file: table1
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Bytes Format Units Label Explanation
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1-10 A10 --- Name Star Name
12-18 I7 --- HD []? HD number
20-33 A14 --- Sp Spectral type
35-39 F5.2 mag V V magnitude
41-45 F5.2 mag B_V B-V color
47-51 I5 --- Image IUE SWP image number
53-57 I5 s ExpTim IUE Exposure Time
59-59 A1 --- n_Flux [H ] 'H' if high-dispersion spectrum
61-61 A1 --- l_Flux limit flag on Lyman alpha flux
63-67 I5 10-16W/m2/nm Flux Lyman alpha flux (in 10-14 erg/cm2/s/A)
69-70 I2 --- q_Flux *[-1/4] Measurement quality (1)
72-72 A1 --- l_NFlux limit flag on normalized Lyman alpha flux
74-80 F7.1 --- NFlux Normalized Lyman alpha flux
(in 10-7 x normalization)
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Note on q_Flux:
Each measurement was assigned a data quality code according to the
signal to noise after removal of the diffuse Lyman alpha background
emission.
-1 - upper limit
1 - good quality
2 - fair quality
3 - poor quality
4 - contains saturated pixels
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Courtesy: Wayne Landsman via NSSDC/ADC
(End) N. Paul M. Kuin [NASA/NSSDC/ADC] 1994-07-18