Apsidal Motion and Physical Parameters in the Eclipsing System V490 Sct
Abstract We report long-term UBVRIR c I c photometry of the highly eccentric 12.04 day detached eclipsing binary V490 Sct ( V = 13.1, B9.5+A0, e = 0.40), which we use to determine its relative and absolute parameters. The absolute masses, radii, and temperatures are M A = 2.33 ± 0.07 M ⊙ , R A = 1.9...
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| Published in: | The Astronomical journal Vol. 164; no. 5; pp. 194 - 200 |
|---|---|
| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Madison
The American Astronomical Society
01-11-2022
IOP Publishing |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Abstract
We report long-term
UBVRIR
c
I
c
photometry of the highly eccentric 12.04 day detached eclipsing binary V490 Sct (
V
= 13.1, B9.5+A0,
e
= 0.40), which we use to determine its relative and absolute parameters. The absolute masses, radii, and temperatures are
M
A
= 2.33 ± 0.07 M
⊙
,
R
A
= 1.90 ± 0.04
R
⊙
, and
T
A
= 9960 ± 60 K for the primary and
M
B
= 2.23±0.07 M
⊙
,
R
B
= 1.86 ± 0.04
R
⊙
, and
T
B
= 9700 ± 80 K for the secondary. The system displays a slow periastron advance that is dominated by General Relativity (GR). Our measurement,
ω
̇
=
0.86
deg century
−1
, is 32% less then the expected rate,
ω
̇
=
1.24
deg century
−1
, which has an 83% contribution from GR. A comparison with current stellar evolution models shows a good match to the measured properties at an age of about 130 Myr and Solar abundance. The photometric parallax of the system
π
= 0.73 ± 0.04 mas, matches the GAIA DR2 value,
π
= 0.76 ± 0.04 mas. |
|---|---|
| Bibliography: | Stars and Stellar Physics AAS34602 |
| ISSN: | 0004-6256 1538-3881 |
| DOI: | 10.3847/1538-3881/ac7d5c |