2001A&A...371.1024M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:55:54

2001A&A...371.1024M - Astronomy and Astrophysics, volume 371, 1024-1034 (2001/6-1)

I. UBV photometry of selected members of the Pleiades and Alpha Persei clusters in 1999.

MESSINA S.

Abstract (from CDS):

The rotational brightness variations in magnetically active stars are due to the combined light contribution of cool spots and bright faculae on the stellar photosphere. The amplitude of the rotational brightness variations can be used to probe the dependence of the amount of photospheric magnetic fields associated to such inhomogeneities on global stellar parameters such as the rotation rate. However, the upper envelope of the amplitude values must be considered, since the rotational modulation amplitude represents a lower limit of the spots and faculae coverage, being their visibility modulation reduced by several factors. In order to determine accurately the maximum amplitude upper envelope and its dependence on global stellar parameters a program of photometric monitoring of ultra fast rotating active members of the Pleiades and Alpha Persei star clusters was undertaken in the fall of 1999. Light curves and period determinations of 21 target stars are presented as result from the first observing season. The newly determined values of amplitudes of the brightness variations versus rotation period have values as expected based on previous results.

Abstract Copyright:

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

Simbad objects: 28

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Number of rows : 28

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 HD 20296 * 03 17 39.3841705921 +46 56 56.292907008   7.56 7.53     A0 12 0
2 V* V525 Per BY* 03 19 02.7581136374 +48 10 59.613783798   12.92       ~ 22 0
3 V* V485 Per BY* 03 24 25.1122226261 +48 48 21.120286635   15.41 14.12     K5 20 0
4 V* V531 Per BY* 03 24 49.7160283185 +48 52 18.293582625   12.41 11.62     G5 44 0
5 V* V688 Per BY* 03 26 04.2107430389 +48 48 07.028032941   11.16 10.59     F9V 26 0
6 V* V486 Per BY* 03 26 27.6559227432 +49 02 12.377118333   13.81 12.84     ~ 23 0
7 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 750 0
8 V* V689 Per BY* 03 32 10.2247664039 +49 08 28.762703896   13.13 11.99     G5V 18 0
9 HD 22156 * 03 36 04.5497784107 +46 35 04.146426119   8.42 7.32     G6III 11 0
10 V* V542 Per BY* 03 40 33.9234059181 +48 04 35.788931023           ~ 10 0
11 Cl Melotte 22 250 SB* 03 44 04.2464661452 +24 59 23.415056429   11.4 10.7     G2 52 0
12 V* V632 Tau Er* 03 44 21.9055414709 +24 46 06.290169505   14.14 13.10 12.81   ~ 64 0
13 V* MX Tau Er* 03 44 23.0586604015 +24 04 05.898383804   15.02 13.82 13.42   M0e 58 0
14 V* V1170 Tau BY* 03 44 26.2759767969 +24 35 22.937157369 14.435 12.288 11.461   10.520 G8V 64 0
15 V* V811 Tau BY* 03 45 21.1860798578 +23 43 38.887563927 14.771 13.67 12.57   11.24 G5 66 0
16 V* OU Tau Er* 03 45 32.9382648825 +24 18 11.647131333   14.63 13.36   12.02 K4V 82 0
17 V* V1041 Tau Er* 03 45 39.4017141586 +23 45 15.471979694 14.355 13.52 12.41 11.99 10.83 G9V 52 0
18 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G0V 115 1
19 V* V812 Tau BY* 03 46 04.1262048432 +23 24 19.877345678 14.725 13.73 12.66   11.62 K3V 60 0
20 V* V641 Tau Er* 03 46 27.7742103991 +23 35 33.769607527 15.602 14.28 13.05   11.52 K0V 72 0
21 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2977 0
22 HD 23654 PM* 03 47 36.9621084147 +23 36 32.817238872   9.016 7.78     K0 28 0
23 V* V541 Tau Er* 03 47 41.1816627383 +23 44 25.020226497   15.21 13.95   12.37 ~ 47 0
24 V* V338 Tau Er* 03 47 59.7361155222 +24 43 52.745169615   14.71 13.51   12.00 K6e 58 0
25 HD 23712 V* 03 48 06.5396158839 +24 59 18.299678626   8.21 6.49     K5 31 0
26 V* V664 Tau Er* 03 49 20.5940855970 +24 46 35.976003209   13.71 12.67   11.40 K2.5V 67 0
27 V* V677 Tau Er* 03 51 29.9391572628 +23 53 57.260596984   14.66 13.49   12.06 K6V: 46 0
28 Cl Melotte 22 68 * ~ ~   16.4       ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:55:54

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