Extremely red stellar objects revealed by IPHAS

Nick Wright, R. Greimel, M.J. Barlow, J.E. Drew, M-R.L. Cioni, A.A. Zijlstra, R.L.M. Corradi, E. Gonzalez-Solares, P. Groot, J. Irwin, M.J. Irwin, A. Mampaso, R.A.H. Morris, D. Steeghs, Y.C. Unruh, N.A. Walton

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
33 Downloads (Pure)


We present photometric analysis and follow-up spectroscopy for a population of
extremely red stellar objects extracted from the point-source catalogue of the INT Photometric H Survey (IPHAS) of the northern galactic plane. The vast majority
of these objects have no previous identification. Analysis of optical, near- and midinfrared 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 filter used for IPHAS observations.

Original languageEnglish
Pages (from-to)929-944
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 2008


Dive into the research topics of 'Extremely red stellar objects revealed by IPHAS'. Together they form a unique fingerprint.

Cite this