2010A&A...515A..81O


Query : 2010A&A...515A..81O

2010A&A...515A..81O - Astronomy and Astrophysics, volume 515, A81-81 (2010/6-1)

Young solar type active stars: the TYC 2627-638-1 system.

OLAH K., KORHONEN H., VIDA K., ILYIN I., DALL T.H., JAERVINEN S.P., JURCSIK J., ANDERSEN M.I., DJUPVIK A.A., PURSIMO T., MOOR A., DATSON J., KARJALAINEN R., LIIMETS T., KUBAT J. and KAWKA A.

Abstract (from CDS):

We present BV(RI)C and JHKs photometry and low- and high-resolution spectroscopy of the 11th mag G-type star TYC 2627-638-1. Our investigation reveals that the target is separated into two young, early-G-type main-sequence (or late pre-main-sequence) stars, which are most probably bound and form a wide binary system. A substellar body orbits the brighter component as implied by radial velocity variations. The brighter component possibly also has a faint, later type stellar companion. Both components of the wide binary have clear emission cores in the CaII H&K lines and filled-in Hα absorption, indicating that both stars are chromospherically active. Our photometric time series reveals clear but only a few hundredths of a magnitude amplitude rotational modulation, which is most likely due to cool starspots. Two distinct periods, near 3.5 and 3.7 days, are found in the brightness variations. Photometry obtained separately of the two components of the wide binary show that these periodicities belong to the brighter star. The fainter component shows a much slower light variation of about 0.3 mag. amplitude. In addition, long-term changes in the brightness of both stars are seen. The spectral energy distribution shows a strong near-infrared excess in the fainter component of the wide binary.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: atmospheres - stars: late-type - starspots

VizieR on-line data: <Available at CDS (J/A+A/515/A81): ab-bvi.dat ab-r.dat ab-bvri.dat a-bvri.dat b-bvri.dat>

Nomenclature: Tables 2, 4: [OKV2010] TYC 2627-638-1A (Nos A-B).

CDS comments: Fig. 1: Comparison stars not in SIMBAD.

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME THA As* 00 00 -62.0           ~ 378 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3103 0
3 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 611 0
4 * bet Oph PM* 17 43 28.3526482 +04 34 02.295484 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 456 0
5 [OKV2010] TYC 2627-638-1B * 18 20 05.3127536270 +31 57 45.582908870   13.21 12.45 12.03 11.62 ~ 1 0
6 GSC 02627-00638 ** 18 20 05.375808 +31 57 44.40132   11.66 11.11 10.659   ~ 1 0
7 [OKV2010] TYC 2627-638-1A * 18 20 05.3902125943 +31 57 44.197914032   11.707 11.098 10.738 10.378 ~ 1 0
8 BD+17 4708 SB* 22 11 31.3751899315 +18 05 34.158392398 9.73 9.91 9.46 9.03 8.70 sdF8 546 0

    Equat.    Gal    SGal    Ecl

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2021.07.24-14:26:35

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