Exploring a New Stellar X-ray Frontier: Investigating the X-ray Emissions of RR Lyr Variables

Details Exploring a New Stellar X-ray Frontier: Investigating the X-ray Emissions of RR Lyr Variables Exploring a New Stellar X-ray Frontier: Investigating the X-ray Emissions of RR Lyr Variables

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2776g&link_type=abstract

Chandra proposal ID #11200496

Physics

Scientific paper

Early theoretical predictions & spectroscopy suggest RR Lyr & Cepheids should be soft X-ray sources (pulsation-induced shocks). Yet no definite X-ray detections were made until the last 2 years when we discovered 3 Cepheids in X-rays (Lx ~ 10^29 ergs/s), likely caused by shock-heated plasmas. With shorter pulsation periods & more rapid atmospheric motions, RR Lyr should be stronger X-ray sources. In this pilot program we request a 50 ksec exposure (to cover the star's P ~13.5 hr pulsation period) to examine if RR Lyr variables join Cepheids as soft X-ray sources. We have selected the proto-type, RR Lyr itself, as the 1st target. These observations will shed new light on the structure, dynamics and heating of the atmospheres of this fundamentally important class of pulsating stars.

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