Extremely red stellar objects revealed by IPHAS
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.
Item Type | Article |
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Date Deposited | 27 Jul 2024 01:08 |
Last Modified | 27 Jul 2024 01:09 |
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Read more research from the creator(s):
- Wright, Nick
- Greimel, R.
- Barlow, M.J.
- Drew, J.E.
- Cioni, M-R.L.
- Zijlstra, A.A.
- Corradi, R.L.M.
- Gonzalez-Solares, E.
- Groot, P.
- Irwin, J.
- Irwin, M.J.
- Mampaso, A.
- Morris, R.A.H.
- Steeghs, D.
- Unruh, Y.C.
- Walton, N.A.
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