A search for young stars in the halo of M31

R. J.H. Mccausland; E. S. Conlon; P. L. Dufton; A. Fitzsimmons; M. J. Irwin; F. P. Keenan

doi:10.1086/172867

A search for young stars in the halo of M31

R. J.H. Mccausland^*, E. S. Conlon, P. L. Dufton, A. Fitzsimmons, M. J. Irwin, F. P. Keenan

^*Corresponding author for this work

School of Mathematics and Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Previous studies have identified young hot stars that appear to have been formed in the halo of our Galaxy. Here we present preliminary results of a spectroscopic search for similar objects in the halo of M31. Radial velocities have been measured for 23 apparently blue objects (selected from APM measurements of Schmidt plates) in a magnitude range B_v ≃ 17-21. For one of these targets, AND 0029+413, the radial velocity suggests that the object is gravitationally bound to M31 and hence that it may be in its halo. However, recent CCD photometry for this object indicates that it is redder than implied by the original photographic observations. A number of possible scenarios are presented to explain this object, including one consistent with it being a young star in the halo of M31.

Original language	English
Pages (from-to)	650-654
Number of pages	5
Journal	Astrophysical Journal
Volume	411
Issue number	2
DOIs	https://doi.org/10.1086/172867
Publication status	Published - 10 Jul 1993

Keywords

Galaxies: individual (M31)
Galaxies: stellar content
Stars: early-type

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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title = "A search for young stars in the halo of M31",

abstract = "Previous studies have identified young hot stars that appear to have been formed in the halo of our Galaxy. Here we present preliminary results of a spectroscopic search for similar objects in the halo of M31. Radial velocities have been measured for 23 apparently blue objects (selected from APM measurements of Schmidt plates) in a magnitude range Bv ≃ 17-21. For one of these targets, AND 0029+413, the radial velocity suggests that the object is gravitationally bound to M31 and hence that it may be in its halo. However, recent CCD photometry for this object indicates that it is redder than implied by the original photographic observations. A number of possible scenarios are presented to explain this object, including one consistent with it being a young star in the halo of M31.",

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author = "Mccausland, {R. J.H.} and Conlon, {E. S.} and Dufton, {P. L.} and A. Fitzsimmons and Irwin, {M. J.} and Keenan, {F. P.}",

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T1 - A search for young stars in the halo of M31

AU - Mccausland, R. J.H.

AU - Conlon, E. S.

AU - Dufton, P. L.

AU - Fitzsimmons, A.

AU - Irwin, M. J.

AU - Keenan, F. P.

PY - 1993/7/10

Y1 - 1993/7/10

N2 - Previous studies have identified young hot stars that appear to have been formed in the halo of our Galaxy. Here we present preliminary results of a spectroscopic search for similar objects in the halo of M31. Radial velocities have been measured for 23 apparently blue objects (selected from APM measurements of Schmidt plates) in a magnitude range Bv ≃ 17-21. For one of these targets, AND 0029+413, the radial velocity suggests that the object is gravitationally bound to M31 and hence that it may be in its halo. However, recent CCD photometry for this object indicates that it is redder than implied by the original photographic observations. A number of possible scenarios are presented to explain this object, including one consistent with it being a young star in the halo of M31.

AB - Previous studies have identified young hot stars that appear to have been formed in the halo of our Galaxy. Here we present preliminary results of a spectroscopic search for similar objects in the halo of M31. Radial velocities have been measured for 23 apparently blue objects (selected from APM measurements of Schmidt plates) in a magnitude range Bv ≃ 17-21. For one of these targets, AND 0029+413, the radial velocity suggests that the object is gravitationally bound to M31 and hence that it may be in its halo. However, recent CCD photometry for this object indicates that it is redder than implied by the original photographic observations. A number of possible scenarios are presented to explain this object, including one consistent with it being a young star in the halo of M31.

KW - Galaxies: individual (M31)

KW - Galaxies: stellar content

KW - Stars: early-type

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A search for young stars in the halo of M31

Abstract

Keywords

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