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J/A+A/312/879 Beta Lyr radial velocities and UBV data (Harmanec+, 1996)
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Jet-like structures in beta Lyrae. Results of optical interferometry,
spectroscopy and photometry
Harmanec P., Morand F., Bonneau D., Jiang Y., Yang S., Guinan E.F.,
Hall D.S., Mourard D., Hadrava P., Bozic H., Sterken C., Tallon-Bosc I.,
Walker G.A.H., McCook G.P., Vakili F., Stee P., Le Contel J.M.
<Astron. Astrophys. 312, 879 (1996)>
=1996A&A...312..879H (SIMBAD/NED BibCode)
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ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry, UBV
Keywords: stars: emission-line, Be - binaries: eclipsing -
Stars: individual: beta Lyr - techniques: interferometric
Description:
A preliminary analysis of an extensive collection of interferometric,
spectroscopic and photometric observations of the bright Be star
{beta} Lyr lead to the following main conclusions:
(1) The bulk of the H{alpha} and He I 6678 emission seems to originate
in jets of material perpendicular to the orbital plane of the binary.
The jets are associated with the more massive component of the binary
(star 1) and probably emanate from the `hot spot' in the disk, i.e.
the region of interaction of the gas stream flowing from the
Roche-lobe filling B6-8II component (star 2) toward star 1. Some
contribution to the emission also comes from a region located between
the two stars (the gas stream and the `hot spot') and from the
`pseudoatmosphere' of the accretion disk around star 1.
(2) The 282-d cyclic variation of the light curve of {beta} Lyr is
confirmed on the basis of 2852 homogenized V-band observations
covering an interval of 36yrs. We find, however, that the amplitude
and phase of these variations vary with the orbital phase: the
long-term modulation of the light curve almost disappears near orbital
phases 0.25P and 0.50P (elongation and secondary eclipse).
(3) Pronounced line-profile variations of the H{alpha} and He I 6678
lines on a time scale shorter than one orbital period were clearly
detected. They may be periodic, with a period near 4.70-4.75d, and
this periodicity may be related to the 282-d change via the orbital
period.
Objects:
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RA (2000) DE Name
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18 50 04.7 +33 21 45.7 Beta Lyr = HD 174638
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a 65 100 Beta Lyr individual radial velocities of the
H alpha line (Reticon Ondrejov)
table2b 76 99 Beta Lyr individual radial velocities of the
He I 6678 line (Reticon Ondrejov)
table2c 65 231 Beta Lyr individual radial velocities of the
H alpha line (DAO CCD 4096 spectra)
table2d 74 231 Beta Lyr individual radial velocities of the
He I 6678 line (DAO CCD 4096 spectra)
table4 72 3949 UBV observations of Beta Lyr, 8 Lyr and 9 Lyr
note4 80 99 Notes to table4
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Byte-by-byte Description of file: table2a, table2c
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Bytes Format Units Label Explanations
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1- 4 I4 --- No File number
6- 17 F12.4 d HJD Heliocentric julian date
20- 27 F8.3 --- cycle Cycle
29- 34 F6.1 km/s RVem ?=9999 Radial velocity of emission wings (1)
37- 42 F6.1 km/s RVpV ?=9999 Radial velocity of V (violet) peak (1)
44- 49 F6.1 km/s RVpR ?=9999 Radial velocity of R (red) peak (1)
52- 57 F6.1 km/s RVabs ?=9999 Radial velocity of absorption component (1)
60- 65 F6.1 km/s RVstar2 Mean stellar velocity of star2
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Note (1): The value 9999. denotes missing items, no measurements was possible.
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Byte-by-byte Description of file: table2b
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Bytes Format Units Label Explanations
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1- 4 I4 --- No File number
6- 17 F12.4 d HJD Heliocentric julian date
20- 27 F8.3 --- cycle Cycle
29- 34 F6.1 km/s RVem ?=9999. Radial velocity of emission wings (1)
36- 41 F6.1 km/s RVabs1 ?=9999. Radial vel. of peak main absorption (1)
43- 48 F6.1 km/s RVabs2 ?=9999. Radial vel. of peak main absorption (1)
50- 55 F6.1 km/s RVabs3 ?=9999. Radial vel. of peak main absorption (1)
57- 62 F6.1 km/s RVstar2 ?=9999. Mean stellar velocity of star2 (1)
64- 69 F6.1 km/s RVabs4 ?=9999. Radial vel. of other absorption (1)
71- 76 F6.1 km/s RVabs5 ?=9999. Radial vel. of other absorption (1)
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Note (1): The value 9999. denotes missing items, no measurements was possible.
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Byte-by-byte Description of file: table2d
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Bytes Format Units Label Explanations
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1- 4 I4 --- No File number
6- 17 F12.4 d HJD Heliocentric julian date
20- 27 F8.3 --- cycle Cycle
29- 33 F5.1 km/s RVe Radial velocity of emission wings
35- 40 F6.1 km/s RVpV Radial velocity of V peak
42- 46 F5.1 km/s RVpR Radial velocity of R peak
48- 53 F6.1 km/s RVabs1 Radial velocity of absorption component 1
55- 60 F6.1 km/s RVstar2 ?=9999. Mean stellar velocity of star2 (1)
62- 67 F6.1 km/s RVabs2 ?=9999. Radial vel. of absorption component 2 (1)
69- 74 F6.1 km/s sat.abs ?=9999. Radial vel. of satellite absorption (1)
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Note (1): The value 9999. denotes missing items, no measurements was possible.
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 21 F12.4 d HJD Heliocentric julian date
23- 26 F4.2 --- w Weight of the observation
28- 33 F6.3 mag Vmag ?=99.999 V magnitude (1)
35- 40 F6.3 mag Bmag ?=99.999 B magnitude (1)
42- 47 F6.3 mag Umag ?=99.999 U magnitude (1)
49- 54 F6.3 mag B-V ?=99.999 B-V color (1)
56- 61 F6.3 mag U-B ?=99.999 U-B color (1)
63- 68 I6 --- HDcomp Name of the comparison star
71- 72 I2 --- Site Site (see note4 file)
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Note (1): The value 99.999 denotes missing items, no measurements was possible.
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Comparison stars used :
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HD star V B-V U-B
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172044 HR 6997 5.423 -.094 -.518
176437 Gamma Lyr 3.253 -.071 -.052
174585 8 Lyr 5.929 -.142 -.715
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Courtesy: Petr Harmanec <hec@sunstel.asu.cas.cz>
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(End) Patricia Bauer [CDS] 11-Apr-1996