2009A&A...504.1021V


Query : 2009A&A...504.1021V

2009A&A...504.1021V - Astronomy and Astrophysics, volume 504, 1021-1029 (2009/9-4)

Photospheric and chromospheric activity in V405 Andromedae. An M dwarf binary with components on the two sides of the full convection limit.

VIDA K., OLAH K., KHOVARI Z., KORHONEN H., BARTUS J., HURTA Z. and POSZTOBANYI K.

Abstract (from CDS):

We investigate the fast-rotating (Porb=Prot=0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)C and optical spectroscopic data. The light variation is caused by the combined effect of spottedness and binarity with a small eclipse. We estimate the system parameters from the available light and radial velocity curves. Three flare events occurred during the observations: two were found in the spectroscopic data and one was observed photometrically in BV(RI)C colours. An interesting eruptive phenomenon emerged from the photometric measurements that can be interpreted as a series of post-flare eruptions lasting for at least 3 orbits (rotations) of the system, originating from trans-equatorial magnetic loops, which connect the active regions in the two hemispheres. The two components of V405 And have masses well over and below the theoretical limit of full convection. This rare property makes the binary an ideal target for observing and testing models for stellar dynamo action.

Abstract Copyright:

Journal keyword(s): stars: individual: V405 Andromedae - binaries: eclipsing - stars: activity - stars: chromospheres - starspots - stars: fundamental parameters

Simbad objects: 13

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Number of rows : 13
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 TYC 3298-478-1 * 02 22 20.2788453384 +47 32 12.744748320   12.64 11.75 11.59   ~ 1 0
2 StKM 1-258 RS* 02 22 25.8585919224 +47 29 19.824973008   12.67 11.57     M0 22 0
3 GSC 03298-00462 * 02 22 30.1258500864 +47 26 43.742711616   14.14 13.70 15.06 13.19 ~ 1 0
4 TYC 3298-780-1 * 02 22 32.9794315872 +47 26 39.319830636   11.78 11.39     ~ 1 0
5 GSC 03298-01186 * 02 22 33.3204598392 +47 26 49.261096968   14.37 13.33 13.00 12.33 ~ 1 0
6 GSC 03298-01110 * 02 22 41.1723379872 +47 29 35.582126316   13.41 12.98 12.85 12.63 ~ 1 0
7 TYC 3298-148-1 * 02 22 54.8103592080 +47 29 55.767960060   11.65 10.89     ~ 1 0
8 NGC 1647 OpC 04 45 55 +19 04.7   6.82 6.4     ~ 150 0
9 2MASS J04463285+1901432 EB* 04 46 32.8622247312 +19 01 43.246330320   19.9 19.0     M 24 0
10 V* WY Cnc RS* 09 01 55.4508997464 +26 41 22.746780564 10.54 10.34 9.60     G5V 195 0
11 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 603 0
12 V* AU Mic LM* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1006 0
13 BD+22 4409 BY* 21 31 01.7140062576 +23 20 07.374015564   10.240 9.245 8.6 7.965 K3Vke 163 0

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2022.07.04-17:48:23

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