IDENTIFYING BLUE HORIZONTAL BRANCH STARS USING THE z FILTER

In this paper we present a new method for selecting blue horizontal branch (BHB) candidates based on color-color photometry. We make use of the Sloan Digital Sky Survey z band as a surface gravity indicator and show its value for selecting BHB stars from quasars, white dwarfs, and main-sequence A-ty...

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Veröffentlicht in:	The Astronomical journal 2012-04, Vol.143 (4), p.1-9
Hauptverfasser:	Vickers, John J, Grebel, Eva K, HUXOR, AVON P
Format:	Artikel
Sprache:	eng
Schlagworte:	ACCURACY ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Bands COLOR FILTERS Galactic structure GRAVITATION Horizontal branch stars MAIN SEQUENCE STARS MILKY WAY PHOTOMETRY PROBES QUASARS Sky surveys (astronomy) Stars WHITE DWARF STARS
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container_title	The Astronomical journal
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creator	Vickers, John J Grebel, Eva K HUXOR, AVON P
description	In this paper we present a new method for selecting blue horizontal branch (BHB) candidates based on color-color photometry. We make use of the Sloan Digital Sky Survey z band as a surface gravity indicator and show its value for selecting BHB stars from quasars, white dwarfs, and main-sequence A-type stars. Using the g, r, i, and ; bands, we demonstrate that extraction accuracies on a par with more traditional u, g, and r photometric selection methods may be achieved. We also show that the completeness necessary to probe major Galactic structure may be maintained. Our new method allows us to efficiently select BHB stars from photometric sky surveys that do not include a u-band filter such as the Panoramic Survey Telescope and Rapid Response System.
doi_str_mv	10.1088/0004-6256/143/4/86
format	Article
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subjects	ACCURACY ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Bands COLOR FILTERS Galactic structure GRAVITATION Horizontal branch stars MAIN SEQUENCE STARS MILKY WAY PHOTOMETRY PROBES QUASARS Sky surveys (astronomy) Stars WHITE DWARF STARS
title	IDENTIFYING BLUE HORIZONTAL BRANCH STARS USING THE z FILTER
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