Chandra Observation of Polaris: Census of Low-mass Companions

Details Chandra Observation of Polaris: Census of Low-mass Companions Chandra Observation of Polaris: Census of Low-mass Companions

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aj....139.1968e&link_type=abstract

The Astronomical Journal, Volume 139, Issue 5, pp. 1968-1974 (2010).

Astronomy and Astrophysics

Astronomy

4

Binaries: General, Stars: Variables: Cepheids, X-Rays: Stars

Scientific paper

We have observed Cepheid Polaris (α UMi A: F7 Ib [Aa] + F6 V [Ab]) with Chandra ACIS-I for 10 ks. An X-ray source was found at the location of Polaris with log LX = 28.89 erg s-1 (0.3-8 keV) and kT = 0.6 keV. A spectrum this soft could come from either the supergiant or the dwarf, as shown by comparable coronal stars. Two resolved low-mass visual companions, "C" and "D," are not physical members of the system based on the lack of X-rays (indicating an age older than the Cepheid) and inconsistent proper motions. Polaris B is not an X-ray source, consistent with its early F spectral type, and probably does not have a lower mass companion itself. A possible more distant member is identified, and an additional less plausible one. This provides a complete census of companions out to 0.1 pc covering a mass ratio range of an order of magnitude and a ΔV of nearly 15 mag.
Based on observations made with the NASA Chandra Satellite.

Affiliated with

Also associated with

No associations

Rating

Chandra Observation of Polaris: Census of Low-mass Companions 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 Chandra Observation of Polaris: Census of Low-mass Companions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra Observation of Polaris: Census of Low-mass Companions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1892022