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Multiwavelength monitoring of BD+53°2790 , the optical counterpart to 4U 2206+54

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Multiwavelength monitoring of BD+53°2790 , the optical counterpart to 4U 2206+54

dc.contributor.author	Blay Serrano, Pedro Jose
dc.contributor.author	Negueruela, I.
dc.contributor.author	Reig Torres, Pablo
dc.contributor.author	Coe, M.J.
dc.contributor.author	Corbet, R.H.D.
dc.contributor.author	Fabregat Llueca, Juan
dc.contributor.author	Tarasov, A.E.
dc.date.accessioned	2010-06-29T10:31:31Z
dc.date.available	2010-06-29T10:31:31Z
dc.date.issued	2006
dc.identifier.citation	BLAY SERRANO, Pedro Jose ; Negueruela, I. ; Reig Torres, Pablo ; Coe, M.J. ; Corbet, R.H.D. ; Fabregat Llueca, Juan ; Tarasov, A.E., 2006, Multiwavelength monitoring of BD+53°2790 , the optical counterpart to 4U 2206+54, Astronomy and Astrophysics, vol. 446, no. 3, p. 1095-1105	en
dc.identifier.uri	http://hdl.handle.net/10550/13991
dc.description.abstract	We present the results of our long-term monitoring of BD +53◦2790, the optical counterpart to the X-ray source 4U 2206+54. Unlike previous studies that classify the source as a Be/X-ray binary, we find that its optical and infrared properties differ from those of typical Be stars: the variability of the V/R ratio is not cyclical; there are variations in the shape and strength of the Hα emission line on timescales less than 1 day; and no correlation between the EW and the IR magnitudes or colors is seen. Our observations suggest that BD +53º2790 is very likely a peculiar O9.5V star. In spite of exhaustive searches we cannot find any significant modulation in any emission line parameter or optical/infrared magnitudes. Spectroscopy of the source extending from the optical to the K-band confirms the peculiarity of the spectrum: not only are the He lines stronger than expected for an O9.5V star but also there is no clear pattern of variability. The possibility that BD +53◦2790 is an early-type analogue to He-strong stars (like θ^1 Ori C) is discussed.	en
dc.language.iso	en	en
dc.subject	Stars ; Early-type ; Emission-line ; Be ; Magnetic fields ; Individual ; BD+53º2790	en
dc.title	Multiwavelength monitoring of BD+53°2790 , the optical counterpart to 4U 2206+54	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.identifier.doi	10.1051/0004-6361:20053951	en
dc.identifier.idgrec	027123	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2006/06/aa3951-05.pdf	en