J/A+AS/122/515 HL Aur light curves and minima (Zhang+ 1997)
HL Aurigae: A near-contact binary system
Zhang R.X., Fang M.J., Zhai D.S.
<Astron. Astrophys. Suppl. Ser. 122, 515 (1997)>
=1997A&AS..122..515Z 1997A&AS..122..515Z (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Ephemerides
Keywords: stars: HL Aur - binaries: eclipsing
Abstract:
Photoelectric observations of HL Aur were carried out with the 60cm
reflector of Beijing Astronomical Observatory in 1990 and 1994, and
the first photoelectric BV light curves were obtained along with a
newly derived ephemeris. The period of the system appears to be
constant over the past 65-years. Using the Wilson-Devinney program a
photometric analysis of the B and V light curves is performed. It is
evident that HL Aur is a near-contact binary with a mass ratio of
q=m2/m1=0.722±0.011. The primary component of the system is
essentially in contact with its Roche lobe, while the secondary is
detached but nearly in contact with its lobe. It is found that the
components of the system are slightly evolved and located near the
terminal-age main sequence. The binary is consistent with the general
evolutionary picture for near-contact systems.
Objects:
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RA (2000) DE Designation(s)
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06 19 08 +49 42.7 HL Aur
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3a 21 129 V magnitude differences of HL Aur
table3b 21 122 B magnitude differences of HL Aur
table5 61 48 Times of minima of HL Aur
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Byte-by-byte Description of file: table3a table3b
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
14- 20 F7.4 mag Dmag Differential magnitude
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
14- 21 F8.1 --- E Integer eclipse cycle number
23- 29 F7.4 --- O-C Observed - Compiled residual
31- 32 I2 --- W Weigth (1)
34- 61 A28 --- Ref Reference (2)
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Note (1): 1: visual observation
2: photographic observation
5: time of minimum derived from somewhat incomplete observations
10: photoelectric observation
Note (2): Fernandes, 1983BAVSM..36....1F 1983BAVSM..36....1F
Frank, 1983BAVSM..36....1F 1983BAVSM..36....1F
Gray and Samec, 1995IBVS.4235....1G 1995IBVS.4235....1G
Kippenhahn, 1955AN....282...73K 1955AN....282...73K
Locher, 1976BBSAG..21....1L 1976BBSAG..21....1L
Moschner and Kleikamp, 1989BAVSM..52....1M 1989BAVSM..52....1M
Moschner and Kleikamp, 1990BAVSM..56....1M 1990BAVSM..56....1M
Pfau, 1955MitVS.198....1P 1955MitVS.198....1P and 1955MitVS.199....1P 1955MitVS.199....1P
Quester, 1978BAVSM..29....1Q 1978BAVSM..29....1Q
Tsesevitch, 1956ACiCh.174....1T 1956ACiCh.174....1T
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(End) Patricia Bauer [CDS] 03-Dec-1996