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J/A+A/250/370       Far-UV excess object survey (Bixler+ 1991)

A high galactic latitude survey of far-ultraviolet excess objects Bixler J.V., Bowyer S., Laget M. <Astron. Astrophys. 250, 370 (1991)> =1991A&A...250..370B (SIMBAD/NED BibCode)
ADC_Keywords: Spectra, ultraviolet ; Stars, subdwarf ; Photometry Keywords: stars: faint blue - stars: subdwarf - surveys - UV radiation Abstract: Optical spectra have been obtained for a selection of objects included in a catalog of far ultraviolet bright, high galactic latitude objects detected with a balloon-borne survey telescope. The observed objects provide a sample of subdwarf O and B stars, white dwarfs, and binary systems including a hot sub-luminous member. Model atmospheres analysis of the sub-dwarf sample is used to determine the temperature, gravity, and helium to hydrogen ratio of the individual objects. A smooth distribution of objects is found on the gravity versus temperature diagram near the theoretical location of the extended horizontal branch. A break between the helium rich and helium poor objects occurs at 40000K. Suspected binary objects were found and analyzed to determine the temperature and gravity of the hot subluminous member in each system. The number of subdwarf stars contained in binaries is determined to be from 65% to 100%. The number versus ultraviolet magnitude distribution of the subdwarf B sample is modeled to obtain a midplane density of 3.3x10-6pc-3 and a population scale height of 240pc. The proportion of white dwarfs that experience the subdwarf phase of evolution is found to be 0.94%. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3 37 15 Composite star candidates appena 26 92 Coordinates of optically observed objects appenc 112 32 Subdwarf B parameters append 80 5 Subdwarf O parameters appene 66 18 White dwarf parameters appenf 33 43 UV (200nm, 12nm FWHM) magnitude of subdwarf B stars identified in Palomar Green (Cat. II/207) survey
See also: <II/207:> Palomar-Green catalog UV-excess stellar objects (Green+ 1986) Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 9 I9 --- ID Ballon identification 11- 12 I2 --- Fig Figure number 14- 18 F5.2 mag ymag y magnitude 19 A1 --- n_ymag [a] See note (1) 21- 25 F5.2 mag m(UV)-b m(UV)-b color index (2) 26 A1 --- n_m(UV)-b [b] b: Anomalously large color 28- 31 F4.2 mag b-y b-y color index 32 A1 --- n_b-y [a] See note (1) 34- 37 F4.2 --- f(6750)/f(5450) fλ(6750)/fλ(5450) ratio
Note (1): a: From Green et al. (1986ApJS...61..305G) Cat. II/207 Note (2): UV magnitude: effective wavelength 200nm, 12nm FWHM
Byte-by-byte Description of file: appena
Bytes Format Units Label Explanations
1- 9 I9 --- ID Balloon number 11- 12 I2 h RAh Right ascension (1950) 14- 17 F4.1 min RAm Right ascension (1950) 20 A1 --- DE- Declination sign (1950) 21- 22 I2 deg DEd Declination (1950) 24- 25 I2 arcmin DEm Declination (1950)
Byte-by-byte Description of file: appenc
Bytes Format Units Label Explanations
1- 9 I9 --- ID Balloon number 11- 15 F5.2 mag m(UV) ? m(UV) magnitude (200nm, 12nm FWHM) 17- 21 F5.2 mag ymag y magnitude 23- 27 F5.2 mag b-y b-y color index 29- 32 F4.1 0.1nm D[0.1]Hb Hβ line width 34- 37 F4.1 0.1nm D[0.1]Hg Hγ line width 39- 43 F5.2 0.1nm EWHb Hβ equivalent width 45- 49 F5.2 0.1nm EWHg Hγ equivalent width 51- 55 F5.3 0.1nm RHb Hβ line depth 57- 61 F5.3 0.1nm RHg Hγ line depth 63- 66 F4.2 [cm/s+2] logg Surface gravity 68- 72 I5 K Teff Effective temperature 74 A1 --- l_EWHeIa Limit flag on EWHeIa 75- 78 F4.2 0.1nm EWHeIa He I 4471A equivalent width 80 A1 --- l_EWHeIb Limit flag on EWHeIb 81- 84 F4.2 0.1nm EWHeIb He I 4922A equivalent width 86 A1 --- l_EWHeII Limit flag on EWHeII 87- 90 F4.2 0.1nm EWHeII He II 4686A equivalent width 92- 95 F4.2 0.1nm e_EW rms uncertainty on EW measurements 97 A1 --- l_He/H Limit flag on He/H 98-102 F5.3 --- He/H He/H ratio 105-112 A8 --- Com Comments (1)
Note (1): 1: Blue photographic magnitude of Green et al. (1986) Cat. II/207 used to compute m(UV)-B 2: Balloon m(UV) not used due to large discrepancy with optical colors 3: Additional optical photometry used
Byte-by-byte Description of file: append
Bytes Format Units Label Explanations
1- 9 I9 --- ID Balloon number 11- 15 F5.2 mag m(UV) m(UV) magnitude (200nm, 12nm FWHM) 17- 21 F5.2 mag ymag y magnitude 23- 27 F5.2 mag b-y b-y color index 29 A1 --- l_EWHeIa Limit flag on EWHeIa 30- 33 F4.2 --- EWHeIa He I 4388A equivalent width 35 A1 --- l_EWHeIb Limit flag on EWHeIb 36- 39 F4.2 --- EWHeIb He I 4471A equivalent width 41 A1 --- l_EWHeIc Limit flag on EWHeIc 42- 45 F4.2 --- EWHeIc He I 4921A equivalent width 47 A1 --- l_H/HeIIa Limit flag on H/HeIIa 48- 51 F4.2 --- H/HeIIa H/He II 4200 A ratio 53 A1 --- l_H/HeIIb Limit flag on H/HeIIb 54- 57 F4.2 --- H/HeIIb H/He II 4340 A ratio 59 A1 --- l_H/HeIIc Limit flag on H/HeIIc 60- 63 F4.2 --- H/HeIIc H/He II 4542 A ratio 65 A1 --- l_H/HeIId Limit flag on H/HeIId 66- 69 F4.2 --- H/HeIId H/He II 4686 A ratio 71- 74 F4.2 --- H/HeIIe H/He II 4861 A ratio 76 A1 --- l_H/HeIIf Limit flag on H/HeIIf 77- 80 F4.2 --- H/HeIIf H/He II 5412 A ratio
Byte-by-byte Description of file: appene
Bytes Format Units Label Explanations
1- 9 I9 --- ID Balloon number 11- 15 F5.2 mag m(UV) ? m(UV) magnitude (200nm, 12nm FWHM) 17- 21 F5.2 mag ymag y magnitude 23- 26 F4.1 0.1nm D[0.1]Hb ? Hβ line width 28- 31 F4.1 0.1nm D[0.1]Hg ? Hγ line width 33- 37 F5.2 0.1nm EWHb Hβ equivalent width 39- 43 F5.2 0.1nm EWHg Hγ equivalent width 45- 49 F5.3 0.1nm RHb Hβ line depth 51- 55 F5.3 0.1nm RHg Hγ line depth 57- 60 F4.2 [cm/s+2] logg ? Surface gravity 62- 66 I5 K Teff ? Effective temperature
Byte-by-byte Description of file: appenf
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension 1950 4- 7 F4.1 min RAm Right ascension 9 A1 --- DE- DEclination sign 10- 11 I2 deg DEd Declination 1950 13- 14 I2 arcmin DEm Declination 17- 25 I9 --- ID Balloon number 27- 31 F5.2 mag m(UV) m(UV) magnitude (200nm, 12nm FWHM)
Table 4: Deconvolution results for composite objects -------------------------------------------------------------------------- Balloon Figure Sec. Temp. Fp-Fs Primary number ID Sp. type (x103K) Optical UV MV logg -------------------------------------------------------------------------- 113435001 1 K4 28 66-34 68-32 6.2 6.3 110607002 2 K0 14 13-87 12-88 8.0 6.6 114041002 3 K5 28 80-20 80-20 5.8 6.1 081300002 4 K1 21 72-28 69-31 5.4 5.9 081400003 6 K4 38 70-30 70-30 6.1 6.5 082800003 7 K1 21 53-47 57-43 6.2 6.6 092200002 12 K3 10 82-18 82-18 4.8 5.0 090900007 13 G2 24 37-63 33-67 5.5 5.9 083738002 14 K3 32 55-45 55-45 6.5 6.6 -------------------------------------------------------------------------- Note to Fp-Fs: yp=-2.5log(Fp/Fs)+ys Fp where Fp is the flux of the primary, Fs is the flux of the secondary, yp is the primary y magnitude and ys the secondary y magnitude -------------------------------------------------------------------------- History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 25-Oct-1996
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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