Hot DB white dwarfs from the sloan digital sky survey

Daniel J. Eisenstein; James Liebert; Detlev Koester; S. J. Kleinmann; Atsuko Nitta; Paul S. Smith; J. C. Barentine; Howard J. Brewington; J. Brinkmann; Michael Harvanek; Jurek Krzesiński; Eric H. Neilsen; Dan Long; Donald P. Schneider; Stephanie A. Snedden

doi:10.1086/504424

Hot DB white dwarfs from the sloan digital sky survey

Daniel J. Eisenstein, James Liebert, Detlev Koester, S. J. Kleinmann, Atsuko Nitta, Paul S. Smith, J. C. Barentine, Howard J. Brewington, J. Brinkmann, Michael Harvanek, Jurek Krzesiński, Eric H. Neilsen, Dan Long, Donald P. Schneider, Stephanie A. Snedden

Steward Observatory

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

66 Scopus citations

Abstract

We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000 and 45,000 K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the "DB gap" between the hotter DO stars and the familiar DB stars cooler than 30,000 K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30,000 than at 20,000 K, suggesting that the "DB gap" is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30,000 to 20,000 K.

Original language	English (US)
Pages (from-to)	676-691
Number of pages	16
Journal	Astronomical Journal
Volume	132
Issue number	2
DOIs	https://doi.org/10.1086/504424
State	Published - Aug 2006

Keywords

Stars: atmospheres
Stars: evolution
White dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/504424

Cite this

@article{9376e81451f147a898e593f8a08956a7,

title = "Hot DB white dwarfs from the sloan digital sky survey",

abstract = "We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000 and 45,000 K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the {"}DB gap{"} between the hotter DO stars and the familiar DB stars cooler than 30,000 K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30,000 than at 20,000 K, suggesting that the {"}DB gap{"} is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30,000 to 20,000 K.",

keywords = "Stars: atmospheres, Stars: evolution, White dwarfs",

author = "Eisenstein, {Daniel J.} and James Liebert and Detlev Koester and Kleinmann, {S. J.} and Atsuko Nitta and Smith, {Paul S.} and Barentine, {J. C.} and Brewington, {Howard J.} and J. Brinkmann and Michael Harvanek and Jurek Krzesi{\'n}ski and Neilsen, {Eric H.} and Dan Long and Schneider, {Donald P.} and Snedden, {Stephanie A.}",

year = "2006",

month = aug,

doi = "10.1086/504424",

language = "English (US)",

volume = "132",

pages = "676--691",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "2",

}

TY - JOUR

T1 - Hot DB white dwarfs from the sloan digital sky survey

AU - Eisenstein, Daniel J.

AU - Liebert, James

AU - Koester, Detlev

AU - Kleinmann, S. J.

AU - Nitta, Atsuko

AU - Smith, Paul S.

AU - Barentine, J. C.

AU - Brewington, Howard J.

AU - Brinkmann, J.

AU - Harvanek, Michael

AU - Krzesiński, Jurek

AU - Neilsen, Eric H.

AU - Long, Dan

AU - Schneider, Donald P.

AU - Snedden, Stephanie A.

PY - 2006/8

Y1 - 2006/8

N2 - We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000 and 45,000 K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the "DB gap" between the hotter DO stars and the familiar DB stars cooler than 30,000 K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30,000 than at 20,000 K, suggesting that the "DB gap" is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30,000 to 20,000 K.

AB - We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000 and 45,000 K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the "DB gap" between the hotter DO stars and the familiar DB stars cooler than 30,000 K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30,000 than at 20,000 K, suggesting that the "DB gap" is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30,000 to 20,000 K.

KW - Stars: atmospheres

KW - Stars: evolution

KW - White dwarfs

UR - http://www.scopus.com/inward/record.url?scp=33749019073&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749019073&partnerID=8YFLogxK

U2 - 10.1086/504424

DO - 10.1086/504424

M3 - Article

AN - SCOPUS:33749019073

SN - 0004-6256

VL - 132

SP - 676

EP - 691

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

ER -

Hot DB white dwarfs from the sloan digital sky survey

Abstract

Keywords

ASJC Scopus subject areas

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SDSS hot DB white dwarfs

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Hot DB white dwarfs from the sloan digital sky survey

Abstract

Keywords

ASJC Scopus subject areas

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SDSS hot DB white dwarfs

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