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


Query : 2001A&A...368..873M

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 - 2022
#notes
1 Cl* Melotte 22 PELS 31 Er* 03 43 19.035552 +22 26 57.12720   12.443 11.490 11.29 10.396 ~ 25 0
2 2MASS J03450400+2515282 Y*O 03 45 04.0131579092 +25 15 28.255253589   11.4 10.7   9.97 ~ 55 0
3 * q Tau * 03 45 12.4957802 +24 28 02.209730 3.73 4.19 4.30 4.30 4.40 B6IV 268 0
4 HD 23387 ** 03 45 37.7883282408 +24 20 08.303093844   7.33 7.19   6.96 A1V 120 0
5 HD 23410 PM* 03 45 48.8151076872 +23 08 49.727194548   6.925 6.909   6.78 A0Va 79 0
6 HD 23479 Er* 03 46 16.0035787584 +24 11 23.722659996   8.91 8.80 8.72 7.57 A7V 99 0
7 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 422 2
8 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3208 0
9 HD 23489 ** 03 46 27.2785317984 +24 15 17.995532328 7.56 7.44 7.34 7.28 7.23 A2V 103 0
10 HD 23568 ** 03 46 59.3943532032 +24 31 12.448365564   6.83 6.82   6.76 B9.5Van 136 0
11 V* V534 Tau dS* 03 47 03.5551874064 +24 49 11.812255356   8.65 8.30   7.83 A9V 106 0
12 HD 23608 SB* 03 47 16.5764110218 +24 07 41.906506002   9.15 8.72   8.09 F3V 79 0
13 V* V647 Tau dS* 03 47 19.3458598776 +24 08 20.815318464   8.51 8.26   7.97 A7Vs 148 0
14 * 24 Tau * 03 47 21.0386292336 +24 06 58.564163952 6.26 6.30 6.28   6.30 A0V 80 0
15 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 524 1
16 HD 23733 ** 03 48 13.5574497288 +24 19 06.222596880   8.73 8.41   7.83 A9V 85 0
17 HD 23778 ** 03 48 34.7984058048 +24 10 52.199121955   9.54 9.05 9.16 8.45 F4V 67 0
18 HD 23792 PM* 03 48 39.3262268880 +21 55 29.861697144   8.78 8.41     F0 31 0
19 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 378 0
20 * 28 Tau Be* 03 49 11.2165977912 +24 08 12.156712008 4.73 5.01 5.09   5.08 B8Vne 453 0
21 HD 23873 * 03 49 21.7502453688 +24 22 51.434157000   6.563 6.586   6.57 B9.5V 127 0
22 HD 282960 ** 03 49 25.704576 +24 56 15.44820   11.743 10.887 10.639 10.00 G2 44 0
23 HD 23964C PM* 03 49 57.4472485560 +23 50 49.472030616   10.95 10.54 9.71   G0Ve 25 0
24 HD 23964A SB* 03 49 58.0556899152 +23 50 55.288075236   6.82 6.81 6.3 6.74 B9.5VspSiSrCr 137 0
25 V* V1289 Tau RS* 03 54 25.2396668585 +24 21 36.310488499   11.84 11.05 9.60   G5IV 42 0

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2022.08.18-03:10:36

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