2001A&A...368..873M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST07:35:55

2001A&A...368..873M - Astronomy and Astrophysics, volume 368, 873-879 (2001/3-4)

Internal kinematics and binarity of X-ray stars in the Pleiades open cluster.

MAKAROV V.V. and ROBICHON N.

Abstract (from CDS):

The classical convergent point analysis is implemented for the Pleiades stars with proper motions in the Tycho-2 Catalogue and X-ray fluxes measured by the ROSAT satellite. It is demonstrated that, with the standard astrometric errors as given in Tycho-2, strong X-ray sources in the cluster (logLX>29.1, where LX is in erg/s) exhibit a velocity dispersion in one component of only 0.20km/s, while the distributions of velocity components of moderate (logLX<29.1) sources and stars not detected by ROSAT at all are consistent with a velocity dispersion of 0.64km/s. The difference is statistically significant at the level of 1.6σ, or 0.95 confidence limit. This result is a clue to the kinematics/X-ray luminosity segregation, similar to that previously discovered in the Hyades open cluster. It is discussed that the segregation may be caused by a wide spread of ages of the member stars. The occurrence of high X-ray luminosities is found to correlate very well with visual binarity and multiplicity (separations >10AU).

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Pleiades - stars: kinematics - astrometry

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 TYC 1247-76-1 PM* 03 43 19.035552 +22 26 57.12720   12.443 11.490 11.29 10.396 ~ 22 0
2 Cl Melotte 22 514 * 03 45 04.0131709191 +25 15 28.254425214   11.4 10.7   9.97 ~ 44 0
3 * q Tau * 03 45 12.4957802 +24 28 02.209730 3.73 4.19 4.30 4.30 4.40 B6IV 256 0
4 HD 23387 * 03 45 37.7918604034 +24 20 08.366306169   7.33 7.19   6.96 A1V 114 1
5 HD 23410 PM* 03 45 48.8148023529 +23 08 49.727348449   6.925 6.909   6.78 A0Va 65 0
6 HD 23479 ** 03 46 16.0038790173 +24 11 23.720970489   8.91 8.80 8.72 7.57 A7V 91 0
7 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 407 2
8 HD 23489 ** 03 46 27.2786964917 +24 15 17.994858056 7.56 7.44 7.34 7.28 7.23 A2V 89 0
9 HD 23568 ** 03 46 59.3945617643 +24 31 12.448129299   6.85 6.83   6.76 B9.5V 127 0
10 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2908 0
11 V* V534 Tau dS* 03 47 03.5764837140 +24 49 11.154761921   8.65 8.30   7.83 A9V 102 0
12 HD 23608 ** 03 47 16.5764110218 +24 07 41.906506002   9.15 8.72   8.09 F3V 73 0
13 V* V647 Tau dS* 03 47 19.3455910441 +24 08 20.814099072   8.51 8.26   7.97 A7Vs 136 0
14 * 24 Tau * 03 47 21.0381093918 +24 06 58.563413901 6.26 6.30 6.28   6.30 A0V 69 0
15 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 507 1
16 HD 23733 ** 03 48 13.5566851068 +24 19 06.236214324   8.73 8.41   7.83 A9V 75 0
17 HD 23778 * 03 48 34.7984058048 +24 10 52.199121955   9.54 9.05 9.16 8.45 F4V 60 0
18 HD 23792 PM* 03 48 39.3239231926 +21 55 29.860054208   8.78 8.41     F0 26 0
19 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 359 0
20 * 28 Tau Be* 03 49 11.2175463444 +24 08 12.172181348 4.73 5.01 5.09   5.08 B8Vne 432 0
21 HD 23873 * 03 49 21.7502535286 +24 22 51.435443225   6.563 6.586   6.57 B9.5V 112 0
22 HD 282960 PM* 03 49 25.7275661846 +24 56 14.816570700   11.7 11.0   10.00 G2 37 0
23 HD 23964C * 03 49 57.4411973444 +23 50 49.482968958   10.95 10.54 9.71   G0Ve 22 0
24 HD 23964A SB* 03 49 58.0553587385 +23 50 55.294451356   6.82 6.81 6.3 6.74 B9.5VspSiSrCr 121 0
25 V* V1289 Tau RS* 03 54 25.2396488830 +24 21 36.310198844   11.84 11.05 9.60   G5IV 27 0

    Equat.    Gal    SGal    Ecl

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2019.10.19-07:35:55

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