| PROPOSAL OVERVIEW | |
| Proposal Title | The X-ray emission of the sdO star BD+28 4211 |
| Proposal Category | Life-cycle of Stars and Planets |
| Proposal Type | LARGE PROGRAM |
| Proposal Id | 088011 |
| Number of Observations | 1 |
| Total exposure time (ks) | 53 |
| PI DETAILS | |
| PI | Mr Nicola La Palombara |
| Institute | INAF - IASF Milano |
| Country | ITALY |
| CO-INVESTIGATORS | ||
| Name | Country | |
| S. Mereghetti | ITALY | |
| P. Esposito | ITALY | |
| A. Tiengo | ITALY | |
| ABSTRACT | |
| Currently only five sdO stars have been detected at X-rays. Three of them are luminous and He-rich stars, while Feige 34 and BD+28 4211 are compact and He-poor. All except the last one have been already observed with XMM, which allowed us to investigate their spectral properties, compare them with those of normal O-type stars, and discuss the origin of the observed X-ray emission. BD+28 4211 is a well known sdO star deeply studied at optical-UV wavelengths. Therefore, we ask to observe also it with XMM, in order to complete the spectral coverage of the X-ray detected sdO stars. This proposal was accepted for the pre vious AO19 but to date the observation has not been performed. | |
| PAPERS |
| - CLASS 1: | papers that present specific XMM-Newton observations |
| - CLASS 2: | papers that refer to published XMM-Newton results with complementary observations, follow-up analysis, or theoretical analysis |
| - CLASS 3: | further deliveries which resulted from the program and which are made available to the community (e.g. source catalogues, processed images or spectra in public data base) |
| - CLASS 4: | comments and suggestions from PI |