J/AN/331/274 UBV photometry of early-type stars (Mayer+, 2010)
Sixty four nights of UBV photometry of early-type stars at La Silla.
Mayer P., Bozic H., Lorenz R., Drechsel H.
<Astron. Nachrichten. 331, 274-281 (2010)>
=2010AN....331..274M 2010AN....331..274M
ADC_Keywords: Binaries, eclipsing ; Stars, early-type ; Photometry, UBV
Keywords: binaries: eclipsing - stars: early type -
stars: individual (MY Ser, V871 Cen, V1051 Cen) -
techniques: photometric
Abstract:
UBV measurements of early-type stars, mostly eclipsing binaries,
obtained at La Silla in the years 1990 to 1994 with the ESO 50cm
telescope are presented. Most of these data were already used in
our individual studies of several binaries. Now all photometric
measurements were reduced again with an advanced technique and are
made available electronically. Our data for MY Ser have not yet been
published; new light curve is given and solved. The result is that
MY Ser is a contact binary, with very large fill-out parameter. Also
a light curve and its solution for V1051 Cen are provided, and the
problem of the period of V871 Cen is pointed out. Besides binaries
(and the comparison and check stars) data for several stars in
southern H II regions are included. Extinction and transformation
coefficients are given.
Description:
Table "nights.dat" contains the list of nights in which usable data
were obtained. Table "standard.dat" is the list of photometric
standards used during reduction of measurements.
In phot subdirectory, tables "tablevXX.dat" present measurements of
variable stars, tables "tablecXX.dat" of check stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
nights.dat 31 65 JD of nights used
stars.dat 61 31 List of variable and check stars
phot/* . 31 UBV photometric data
standard.dat 69 34 Measurements of standard stars
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Byte-by-byte Description of file: nights.dat
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Bytes Format Units Label Explanations
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1- 7 I7 d JD Julian date (1)
10- 14 F5.3 mag extV Extinction coefficient in V per unit of air mass
17- 21 F5.3 mag extB Extinction coefficient in B per unit of air mass
24- 28 F5.3 mag extU Extinction coefficient in U per unit of air mass
31 A1 -- Season [a-g] Name of the season
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Note (1): the night JD 2449158 was divided in two parts during reduction.
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
18- 19 I2 h RAh Simbad Right ascension (J2000)
21- 22 I2 min RAm Simbad Right ascension (J2000)
24- 27 F4.1 s RAs Simbad Right ascension (J2000)
29 A1 --- DE- Simbad declination sign (J2000)
30- 31 I2 deg DEd Simbad declination (J2000)
33- 34 I2 arcmin DEm Simbad declination (J2000)
36- 37 I2 arcsec DEs Simbad declination (J2000)
40- 51 A12 --- FileName Name of photometric file in "phot" subdirectory
53- 61 F9.6 d Per ? Orbital period
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Byte-by-byte Description of file: phot/*
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 23 F12.4 d HJD Heliocentric Julian date
25- 28 F4.2 -- Weight Weight of the data point
30- 35 F6.3 mag Vmag Johnson V magnitude
37- 42 F6.3 mag Bmag Johnson B magnitude
44- 49 F6.3 mag Umag Johnson U magnitude
51- 56 F6.3 mag B-V Johnson B-V colour index
58- 63 F6.3 mag U-B Johnson U-B colour index
66- 70 F5.3 -- X Air mass of the observation
72- 76 F5.3 -- dX Air mass difference between var. and comp.
78- 83 I6 -- Comp HD number of the comparison star
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Byte-by-byte Description of file: standard.dat
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Bytes Format Units Label Explanations
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1- 10 A10 -- Name HD or BD name
12- 13 A2 -- Sys Gr - standard by Graham, La - by Landolt
16- 21 F6.3 mag Vmagl V according to Gr or La
24- 29 F6.3 mag B-Vl B-V according to Gr or La
32- 37 F6.3 mag U-Bl U-B according to Gr or La
40- 45 F6.3 mag Vmag Observed value of V
48- 53 F6.3 mag B-V Observed value of B-V
56- 61 F6.3 mag U-B Observed value of U-B
64- 65 I2 -- nMeas Number of measurements
68- 69 I2 -- Note [1/13]? Note (1)
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Note (1): Notes as follows:
1 = U meas. uncertain; NSV 1455
2 = Not used as standard; NSV 2075
3 = U-B=-1.259 by Landolt & Uomoto (2007, Cat. J/AJ/133/768)
differs from Graham's value more than our value
4 = U meas. uncertain
5 = Not used as standard; NSV 3806
6 = Not used as standard; BT CMi
7 = Not used as standard
8 = Not used as standard; our data are close to
Cousins (1984SAAOC...8...59C 1984SAAOC...8...59C)
9 = Probably variable
10 = Not used as standard; NSV 19225
11 = Not used as standard; GP Vir
12 = Our data are close to data by Hill et al. (1974MNRAS.168..451H 1974MNRAS.168..451H)
13 = Our data are close to data by Neckel & Chini (1981A&AS...45..451N 1981A&AS...45..451N)
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Acknowledgements:
Pavel Mayer, mayer(at)cesnet.cz
(End) Patricia Vannier [CDS] 11-May-2010