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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 80 275 Lyman-alpha fluxes
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
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 A1 --- n_Flux [H ] 'H' if high-dispersion spectrum 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 A1 --- l_NFlux limit flag on normalized Lyman alpha flux 74- 80 F7.1 --- NFlux Normalized Lyman alpha flux (in 10-7 x normalization)
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
Courtesy: Wayne Landsman via NSSDC/ADC
(End) N. Paul M. Kuin [NASA/NSSDC/ADC] 1994-07-18
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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