2011A&A...527A..14H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:04:32

2011A&A...527A..14H - Astronomy and Astrophysics, volume 527A, 14-14 (2011/3-1)

Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue. III. Two new low-mass systems with rapidly evolving spots.

HELMINIAK K.G., KONACKI M., ZLOCZEWSKI K., RATAJCZAK M., REICHART D.E., IVARSEN K.M., HAISLIP J.B., CRAIN J.A., FOSTER A.C., NYSEWANDER M.C. and LACLUYZE A.P.

Abstract (from CDS):

We present the results of our spectroscopic and photometric analysis of two newly discovered low-mass detached eclipsing binaries found in the All-Sky Automated Survey (ASAS) catalogue: ASAS J093814-0104.4 and ASAS J212954-5620.1. Using the Grating Instrument for Radiation Analysis with a Fibre-Fed Echelle (GIRAFFE) on the 1.9-m Radcliffe telescope at the South African Astronomical Observatory (SAAO) and the University College London Echelle Spectrograph (UCLES) on the 3.9-m Anglo-Australian Telescope, we obtained high-resolution spectra of both objects and derived their radial velocities (RVs) at various orbital phases. The RVs of both objects were measured with the two-dimensional cross-correlation technique (TODCOR) using synthetic template spectra as references. We also obtained V and I band photometry using the 1.0-m Elizabeth telescope at SAAO and the 0.4-m Panchromatic Robotic Optical Monitoring and Polarimetry Telescopes (PROMPT) located at the Cerro Tololo Inter-American Observatory (CTIO). The orbital and physical parameters of the systems were derived with PHOEBE and JKTEBOP codes. We compared our results with several sets of widely-used isochrones. Our multi-epoch photometric observations demonstrate that both objects show significant out-of-eclipse modulations, which vary in time. We believe that this effect is caused by stellar spots, which evolve on time scales of tens of days. For this reason, we constructed our models on the basis of photometric observations spanning short time scales (less than a month). Our modeling indicates that (1) ASAS J093814-0104.04 is a main sequence active system with nearly-twin components with masses of M1=0.771±0.033M, M2=0.768±0.021M and radii of R1=0.772±0.012R and R2=0.769±0.013R. (2) ASAS J212954-5620.1 is a main sequence active binary with component masses of M1=0.833±0.017M, M2=0.703±0.013M and radii of R1=0.845±0.012R and R2=0.718±0.017R. Both systems seem to confirm the well-known characteristic of active low-mass stars, for which the observed radii are larger and the temperatures lower than predicted by evolutionary models. Other parameters agree within errors with the models of main sequence stars. The time-varying spot configuration may imply a variable level of activity, which may manifest itself in small changes of the measured radii.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: late-type - stars: individual: ASAS J093814-0104.4 - stars: individual: ASAS J212954-5620.1

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ASAS J052821+0338.5 EB* 05 28 20.8305520540 +03 38 32.608040911           ~ 20 0
2 V* YY Gem BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 817 0
3 BD-15 2429 Al* 08 25 51.6054049425 -16 22 47.397127759   11.45 10.29 9.73 9.36 K7V+M0/2:V 34 0
4 V* CU Cnc Er* 08 31 37.5740891049 +19 23 39.398696822   12.83 11.809 11.592   M5Ve 196 0
5 GSC 03798-01207 EB* 08 44 11.0378523826 +54 23 47.455589275   14.76 13.67 13.36   M 22 0
6 Cl* NGC 2682 SAND 1082 Al* 08 51 20.7915 +11 53 26.168   11.66 11.150 11.09 10.722 F5IV 114 0
7 ASAS J093814-0104.4 EB* 09 38 13.4944051324 -01 04 28.157947703   13.27 12.31 12.00 11.107 ~ 9 0
8 V* UV Leo Al* 10 38 20.7689543921 +14 16 03.664614856   9.62 8.92 9.188 8.194 G0V 249 0
9 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 684 0
10 LP 133-373 EB* 14 04 08.8831591084 +50 20 38.639643937   16.3   15.2   ~ 18 0
11 V* GU Boo EB* 15 21 54.8242649848 +33 56 09.067728168     13.11     M0/M1.5 85 0
12 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 403 0
13 NAME TrES-Her0-07621 EB* 16 50 20.7264221733 +46 39 01.368154597     15.51     ~ 20 0
14 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0
15 GSC 08814-01026 Al* 21 29 53.8513793213 -56 20 03.863437667   13.1 11.927   10.608 ~ 11 0
16 V* RT Lac RS* 22 01 30.7407751260 +43 53 25.640188873   10.092 8.84     G9+K1IVIV 263 0
17 BD-22 5866 Al* 22 14 38.3613804926 -21 41 53.282077032   11.72 10.428 10.137 8.606 M0Ve 32 1
18 NAME Pleiades Moving Group MGr ~ ~           ~ 238 1
19 NAME Hercules Stream MGr ~ ~           ~ 182 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:04:32

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