Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26772
DC Field | Value | Language |
---|---|---|
dc.contributor.author | MEREGHETTI, Sandro | en_US |
dc.contributor.author | LA PALOMBARA, NICOLA | en_US |
dc.contributor.author | TIENGO, ANDREA | en_US |
dc.contributor.author | ESPOSITO, PAOLO | en_US |
dc.date.accessioned | 2020-08-24T11:42:18Z | - |
dc.date.available | 2020-08-24T11:42:18Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26772 | - |
dc.description.abstract | We report the results of a new XMM-Newton observation of the helium-rich hot subdwarf BD+37°442 carried out in 2016 February. The possible periodicity at 19 s seen in a 2011 shorter observation is not confirmed, thus dismissing the evidence for a binary nature. This implies that the observed soft X-ray emission, with a luminosity of a few 10<SUP>31</SUP> erg s<SUP>-1</SUP>, originates in BD+37°442 itself, rather than in an accreting neutron star companion. The X-ray spectrum is well fit by thermal plasma emission with a temperature of 0.22 keV and non-solar element abundances. Besides the overabundance of He, C and N already known from optical/UV studies, the X-ray spectra indicate also a significant excess of Ne. The soft X-ray spectrum and the ratio of X-ray to bolometric luminosity, L<SUB>X</SUB>/L<SUB>BOL</SUB> ∼ 2 × 10<SUP>-7</SUP>, are similar to those observed in massive early-type stars. This indicates that the mechanisms responsible for plasma shock-heating can work also in the weak stellar winds (mass-loss rates dot{M}_W≤ 10^{-8} M<SUB>☉</SUB> yr<SUP>-1</SUP>) of low-mass hot stars. | en_US |
dc.language.iso | eng | en_US |
dc.title | The lack of X-ray pulsations in the extreme helium star BD+37°442 and its possible stellar wind X-ray emission | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw3335 | en_US |
dc.identifier.scopus | 2-s2.0-85018338423 | en_US |
dc.identifier.isi | 000398418600030 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/466/3/2918/2736293 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 466 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 2918 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017MNRAS.466.2918M | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.fulltext | With Fulltext | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.orcid | 0000-0003-3259-7801 | - |
crisitem.author.orcid | 0000-0001-7015-6359 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stw3335.pdf | PDF editoriale | 311.97 kB | Adobe PDF | View/Open |
Page view(s)
56
checked on Aug 5, 2024
Download(s)
15
checked on Aug 5, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.