2008ApJ...687.1253D


Query : 2008ApJ...687.1253D

2008ApJ...687.1253D - Astrophys. J., 687, 1253-1263 (2008/November-2)

T-Lyr1-17236: a long-period low-mass eclipsing binary.

DEVOR J., CHARBONNEAU D., TORRES G., BLAKE C.H., WHITE R.J., RABUS M., O'DONOVAN F.T., MANDUSHEV G., BAKOS G.A., FURESZ G. and SZENTGYORGYI A.

Abstract (from CDS):

We describe the discovery of a 0.68+0.52 M eclipsing binary (EB) with an 8.4 day orbital period, found through a systematic search of 10 fields of the Trans-atlantic Exoplanet Survey (TrES). Such long-period low-mass EBs constitute critical test cases for resolving the long-standing discrepancy between the theoretical and observational mass-radius relations at the bottom of the main sequence. It has been suggested that this discrepancy may be related to strong stellar magnetic fields, which are not properly accounted for in current theoretical models. All previously well-characterized low-mass main-sequence EBs have periods of a few days or less, and their components are therefore expected to be rotating rapidly as a result of tidal synchronization, thus generating strong magnetic fields. In contrast, the binary system described here has a period that is more than 3 times longer than previously characterized low-mass main-sequence EBs, and its components rotate relatively slowly. It is therefore expected to have a weaker magnetic field and to better match the assumptions of theoretical stellar models. Our follow-up observations of this EB yield preliminary stellar properties that suggest it is indeed consistent with current models. If further observations confirm a low level of activity in this system, these determinations would provide support for the hypothesis that the mass-radius discrepancy is at least partly due to magnetic activity.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Binaries: Eclipsing - Stars: Fundamental Parameters - stars: individual (T-Lyr1-17236) - Stars: Late-Type

CDS comments: Table 1 : OGLE BW5 V38 is a misprint for OGLE BW3 V38 ? (cf. Maceroni & Montalban (2004) = 2004A&A...426..577M)

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* GX And Er* 00 18 22.8849799680 +44 01 22.637951588   10.120   7.3   M2V 500 0
2 * gam Cas Be* 00 56 42.5310945 +60 43 00.264089 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1171 2
3 2MASS J01542930+0053266 EB* 01 54 29.3039596704 +00 53 26.697572880           M0+M1 17 0
4 NAME SDSS-MEB-1 SB* 03 18 23.8769202096 -01 00 18.413811144         16.91 ~ 24 0
5 V* RR Cae WD* 04 21 05.5631820426 -48 39 07.061113433 14.50 14.92 14.40     DA7.8 144 1
6 2MASS J04463285+1901432 EB* 04 46 32.8622247312 +19 01 43.246330320   19.9 19.0     M 24 0
7 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 323 0
8 V* YY Gem BY* 07 34 37.4474327544 +31 52 10.179641496 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 842 0
9 V* CU Cnc SB* 08 31 37.5741841080 +19 23 39.398029332   12.83 11.809 11.592   M5Ve 211 0
10 FBS 1345+796 EB* 13 45 34.8710774664 +79 23 48.290145432     13.363 13.074   M4/5 40 0
11 * 109 Vir PM* 14 46 14.9253599 +01 53 34.384496 3.69 3.72 3.73 3.66 3.68 A0IIInn 329 0
12 V* GU Boo EB* 15 21 54.8243257728 +33 56 09.067285032     13.11     M0/M1.5 91 0
13 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 425 0
14 NAME TrES-Her0-07621 EB* 16 50 20.7262037184 +46 39 01.369643976     15.51     ~ 22 0
15 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13182 0
16 OGLE BW3 V38 EB* 18 04 44.2025491872 -30 09 05.497738668     18.300   16.3335 ~ 42 0
17 TYC 458-434-1 EB* 18 30 51.9303 +07 09 18.781   12.73 12.35 12.11   K7V 14 0
18 USNO-B1.0 1366-00314297 * 19 07 14.4787946424 +46 40 07.467347388   19.5   18.6   ~ 1 0
19 USNO-B1.0 1366-00314302 * 19 07 15.5801149752 +46 40 19.808864076   18.8   17.3   ~ 1 0
20 [DCO2008] T-Lyr1-17236 EB* 19 07 16.6174666272 +46 39 53.151765336   16.110 14.37 14.410   ~ 27 0

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2022.09.26-23:37:33

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