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Extremely red stellar objects revealed by IPHAS

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Wright, Nick J., Greimel, R., Barlow, Michael J., Drew, J. E., Cioni, Maria-Rosa Lucia, Zijlstra, A. A., Corradi, R. L. M. (Romano L. M.), Gonzalez-Solares, E. A., Groot, P. J. (Paul J.), Irwin, J., Irwin, M. J., Mampaso, A. (Antonio), Morris, R. A. H., Steeghs, D. (Danny), 1972-, Unruh, Y. C. and Walton, N. A. (Nicholas A.). (2008) Extremely red stellar objects revealed by IPHAS. Monthly Notices of the Royal Astronomical Society, Vol.390 (No.3). pp. 929-944. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2008.13851.x

Abstract

We present photometric analysis and follow-up spectroscopy for a population of extremely red stellar objects extracted from the point-source catalogue of the Isaac Newton Telescope (INT) Photometric H alpha Survey (IPHAS) of the northern Galactic plane. The vast majority of these objects have no previous identification. Analysis of optical, near- and mid-infrared photometry reveals that they are mostly highly reddened asymptotic giant branch stars, with significant levels of circumstellar material. We show that the distribution of these objects traces galactic extinction, their highly reddened colours being a product of both interstellar and circumstellar reddening. This is the first time that such a large sample of evolved low-mass stars has been detected in the visual and allows optical counterparts to be associated with sources from recent infrared surveys.

Follow-up spectroscopy on some of the most interesting objects in the sample has found significant numbers of S-type stars which can be clearly separated from oxygen-rich objects in the IPHAS colour-colour diagram. We show that this is due to the positions of different molecular bands relative to the narrow-band H alpha filter used for IPHAS observations. The IPHAS (r' - H alpha) colour offers a valuable diagnostic for identifying S-type stars. A selection method for identifying S-type stars in the Galactic plane is briefly discussed and we estimate that over a thousand new objects of this type may be discovered, potentially doubling the number of known objects in this short but important evolutionary phase.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Official Date:	1 November 2008
Volume:	Vol.390
Number:	No.3
Number of Pages:	16
Page Range:	pp. 929-944
Identification Number:	10.1111/j.1365-2966.2008.13851.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
Related URLs:	Other Repository
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URI:	http://wrap.warwick.ac.uk/id/eprint/29173