2003A&A...404..631A


Query : 2003A&A...404..631A

2003A&A...404..631A - Astronomy and Astrophysics, volume 404, 631-636 (2003/6-3)

Effect of chromospheric activity on the mean colours of late-type stars. II. Is (B-V)0 also affected?

AMADO P.J.

Abstract (from CDS):

We confirm the existence of an ``excess'' in the mean dereddened (U-B)0 colour of active single-lined spectroscopic giants over quiescent stars of the same spectral type and find evidence for this ``excess'' in (B-V)0, although at a lower scale, when plotted against (R-I)0. This result suggests that the use of (B-V)0 calibrations to determine fundamental parameters or spectral types for late-type active stars should be taken with caution. Since magnetic activity is definitely involved, these and similar calibrations using (U-B)0 and/or (B-V)0 should not be used for the study of late-type young clusters' members or late-type pre-main sequence stars without some consideration. Instead, near-infrared colours like (R-I)0 should be better temperature indicators for these stars.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: fundamental parameters - stars: late-type

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* UX Ari RS* 03 26 35.3756804760 +28 42 54.226408428 7.76 7.28 6.37     K0IV 683 0
2 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.79 5.90 5.4   K2:Vnk 1152 0
3 V* YZ Men RS* 05 10 26.7502372080 -77 13 01.526708712   8.85 7.77   6.566 K1IIIp 47 0
4 V* V1321 Ori Or* 05 35 04.3009445808 -05 08 12.737523192   11.94 10.538   9.117 K0III 99 0
5 HD 37171 SB* 05 37 04.3824418008 +11 02 05.985111696 9.43 7.50 5.90 4.71 3.77 K5III 61 0
6 V* V1149 Ori RS* 05 41 26.7877889088 +03 46 40.934823384   7.96 6.82     K0III 87 0
7 V* V344 Pup RS* 07 36 13.8053448264 -44 57 27.454999500   7.95 6.89     K2III 51 0
8 NGC 2516 OpC 07 58 06 -60 48.0           ~ 671 0
9 V* VX Pyx RS* 08 32 58.5001559256 -34 38 02.540585832   7.318 6.366     G8III 74 0
10 V* IL Hya RS* 09 24 49.0136973144 -23 49 34.714396272   8.38 7.37     K2IV/Vp 165 0
11 V* IN Vel RS* 09 37 12.9608447520 -42 01 14.490830892   10.26 9.08   7.767 K2IIIp 61 0
12 V* GX Lib RS* 15 23 26.0566952568 -06 36 37.745079696   8.39 7.35     G8IVp 111 0
13 V* MM Her RS* 17 58 38.5191368904 +22 08 46.780356588   9.24 9.563 8.01 8.574 G0 133 0
14 V* V4138 Sgr RS* 19 22 40.3015654608 -20 38 34.472405976   7.76 6.74     K2IIICNVp 82 0

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2023.02.02-19:14:24

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