A survey for EHB stars in the galactic bulge

Donald M. Terndrup; Deokkeun An; Angela Hansen; Ruth C. Peterson; Alistair R. Walker; Elaine M. Sadler

doi:10.1023/B:ASTR.0000044328.04425.c1

A survey for EHB stars in the galactic bulge

Donald M. Terndrup, Deokkeun An, Angela Hansen, Ruth C. Peterson, Alistair R. Walker, Elaine M. Sadler

Department of Science Education

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6 Scopus citations

Abstract

We present a progress report on an extensive survey to find and characterize all types of horizontal-branch stars in the nuclear bulge of the Galaxy. We have obtained wide, shallow imaging in UBV of ≈12 square degrees in the bulge, with follow-up spectroscopy for radial velocities and metal abundance determinations. We have discovered a number of metal-rich blue HB stars, whose presence in the bulge is expected by the interpretation of the extragalactic ultraviolet excess. Very deep images have been obtained in UBV and SDSS u along the bulge minor axis, which reveal a significant number of EHB candidates fainter than B=19, i.e., with the same absolute magnitudes as EHB stars in several globular clusters.

Original language	English
Pages (from-to)	247-252
Number of pages	6
Journal	Astrophysics and Space Science
Volume	291
Issue number	3-4
DOIs	https://doi.org/10.1023/B:ASTR.0000044328.04425.c1
State	Published - 2004

Keywords

bulge
evolution
galaxy:
horizontal-branch
stars:

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title = "A survey for EHB stars in the galactic bulge",

abstract = "We present a progress report on an extensive survey to find and characterize all types of horizontal-branch stars in the nuclear bulge of the Galaxy. We have obtained wide, shallow imaging in UBV of ≈12 square degrees in the bulge, with follow-up spectroscopy for radial velocities and metal abundance determinations. We have discovered a number of metal-rich blue HB stars, whose presence in the bulge is expected by the interpretation of the extragalactic ultraviolet excess. Very deep images have been obtained in UBV and SDSS u along the bulge minor axis, which reveal a significant number of EHB candidates fainter than B=19, i.e., with the same absolute magnitudes as EHB stars in several globular clusters.",

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TY - JOUR

T1 - A survey for EHB stars in the galactic bulge

AU - Terndrup, Donald M.

AU - An, Deokkeun

AU - Hansen, Angela

AU - Peterson, Ruth C.

AU - Walker, Alistair R.

AU - Sadler, Elaine M.

PY - 2004

Y1 - 2004

N2 - We present a progress report on an extensive survey to find and characterize all types of horizontal-branch stars in the nuclear bulge of the Galaxy. We have obtained wide, shallow imaging in UBV of ≈12 square degrees in the bulge, with follow-up spectroscopy for radial velocities and metal abundance determinations. We have discovered a number of metal-rich blue HB stars, whose presence in the bulge is expected by the interpretation of the extragalactic ultraviolet excess. Very deep images have been obtained in UBV and SDSS u along the bulge minor axis, which reveal a significant number of EHB candidates fainter than B=19, i.e., with the same absolute magnitudes as EHB stars in several globular clusters.

AB - We present a progress report on an extensive survey to find and characterize all types of horizontal-branch stars in the nuclear bulge of the Galaxy. We have obtained wide, shallow imaging in UBV of ≈12 square degrees in the bulge, with follow-up spectroscopy for radial velocities and metal abundance determinations. We have discovered a number of metal-rich blue HB stars, whose presence in the bulge is expected by the interpretation of the extragalactic ultraviolet excess. Very deep images have been obtained in UBV and SDSS u along the bulge minor axis, which reveal a significant number of EHB candidates fainter than B=19, i.e., with the same absolute magnitudes as EHB stars in several globular clusters.

KW - bulge

KW - evolution

KW - galaxy:

KW - horizontal-branch

KW - stars:

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SP - 247

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JO - Astrophysics and Space Science

JF - Astrophysics and Space Science

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A survey for EHB stars in the galactic bulge

Abstract

Keywords

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