First results from ROSAT all-sky survey observations of the Hyades cluster

Details First results from ROSAT all-sky survey observations of the Hyades cluster First results from ROSAT all-sky survey observations of the Hyades cluster

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l.159s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 2, p. L159-L162.

Astronomy and Astrophysics

Astronomy

50

Open Clusters, Rosat Mission, Sky Surveys (Astronomy), Spaceborne Astronomy, X Ray Stars, Astronomical Catalogs, Astronomical Maps, Binary Stars, Giant Stars, K Stars

Scientific paper

We present preliminary ROSAT all-sky survey results for the Hyades cluster. We detected 108 Hyades cluster members as X-ray sources with L(y) greater than about 3 x 10 exp 28 ergs/s. A number of short-period, chromospherically active binary systems and the giants Theta1 Tau and Gamma Tau are among the most X-ray-luminous objects in the cluster. The second brightest X-ray source, HR 1394 = 71 Tau = VB 141, is a long-period lunar occultation binary. Seven cluster members were also seen in the Wide Field Camera EUV all-sky survey. Among the stars detected in both X-rays and EUV is the Hyades white dwarf EG 37 (= VR 16), confirming an earlier serendipitous EXOSAT detection. We also report the first X-ray detection of the Hyades K0 giant Epsilon Tau, at roughly the survey limit. This new result establishes all four Hyades giants as X-ray emitters, although with an about 50:1 range in L(x). A comparison of Einstein and ROSAT data for three of the giants suggests that long-term X-ray variability, perhaps due to activity cycles, may be partly responsible for the wide dispersion in L(x).

Affiliated with

Also associated with

No associations

Rating

First results from ROSAT all-sky survey observations of the Hyades cluster does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with First results from ROSAT all-sky survey observations of the Hyades cluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and First results from ROSAT all-sky survey observations of the Hyades cluster will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1551839