Five WC9 stars discovered in the AAO/UKST Hα survey

E. C. Hopewell; M. J. Barlow; J. E. Drew; Y. C. Unruh; Q. A. Parker; M. J. Pierce; P. A. Crowther; C. Knigge; S. Phillipps; A. A. Zijlstra

doi:10.1111/j.1365-2966.2005.09487.x

Five WC9 stars discovered in the AAO/UKST Hα survey

E. C. Hopewell^*, M. J. Barlow, J. E. Drew, Y. C. Unruh, Q. A. Parker, M. J. Pierce, P. A. Crowther, C. Knigge, S. Phillipps, A. A. Zijlstra

^*Corresponding author for this work

Research output: Contribution to journal › Review article › peer-review

11 Citations (Scopus)

Abstract

We report the discovery of five massive Wolf-Rayet (WR) stars resulting from a programme of follow-up spectroscopy of candidate emission-line stars in the Anglo-Australian Observatory United Kingdom Schmidt Telescope (AAO/UKST) Southern Galactic Plane Hα survey. The 6195-6775 Å spectra of the stars are presented and discussed. A WC9 class is assigned to all five stars through comparison of their spectra with those of known late-type WC stars, bringing the known total number of Galactic WC9 stars to 44. Whilst three of the five WC9 stars exhibit near-infrared (NIR) excesses characteristic of hot dust emission (as seen in the great majority of known WC9 stars), we find that two of the stars show no discernible evidence of such excesses. This increases the number of known WC9 stars without NIR excesses to seven. Reddenings and distances for all five stars are estimated.

Original language	English
Pages (from-to)	857-866
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	363
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2005.09487.x
Publication status	Published - 1 Nov 2005

Keywords

Circumstellar matter
Galaxy: stellar content
Stars: Wolf-Rayet
Surveys

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10.1111/j.1365-2966.2005.09487.x

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title = "Five WC9 stars discovered in the AAO/UKST Hα survey",

abstract = "We report the discovery of five massive Wolf-Rayet (WR) stars resulting from a programme of follow-up spectroscopy of candidate emission-line stars in the Anglo-Australian Observatory United Kingdom Schmidt Telescope (AAO/UKST) Southern Galactic Plane Hα survey. The 6195-6775 {\AA} spectra of the stars are presented and discussed. A WC9 class is assigned to all five stars through comparison of their spectra with those of known late-type WC stars, bringing the known total number of Galactic WC9 stars to 44. Whilst three of the five WC9 stars exhibit near-infrared (NIR) excesses characteristic of hot dust emission (as seen in the great majority of known WC9 stars), we find that two of the stars show no discernible evidence of such excesses. This increases the number of known WC9 stars without NIR excesses to seven. Reddenings and distances for all five stars are estimated.",

keywords = "Circumstellar matter, Galaxy: stellar content, Stars: Wolf-Rayet, Surveys",

author = "Hopewell, {E. C.} and Barlow, {M. J.} and Drew, {J. E.} and Unruh, {Y. C.} and Parker, {Q. A.} and Pierce, {M. J.} and Crowther, {P. A.} and C. Knigge and S. Phillipps and Zijlstra, {A. A.}",

year = "2005",

month = nov,

day = "1",

doi = "10.1111/j.1365-2966.2005.09487.x",

language = "English",

volume = "363",

pages = "857--866",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press",

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TY - JOUR

T1 - Five WC9 stars discovered in the AAO/UKST Hα survey

AU - Hopewell, E. C.

AU - Barlow, M. J.

AU - Drew, J. E.

AU - Unruh, Y. C.

AU - Parker, Q. A.

AU - Pierce, M. J.

AU - Crowther, P. A.

AU - Knigge, C.

AU - Phillipps, S.

AU - Zijlstra, A. A.

PY - 2005/11/1

Y1 - 2005/11/1

N2 - We report the discovery of five massive Wolf-Rayet (WR) stars resulting from a programme of follow-up spectroscopy of candidate emission-line stars in the Anglo-Australian Observatory United Kingdom Schmidt Telescope (AAO/UKST) Southern Galactic Plane Hα survey. The 6195-6775 Å spectra of the stars are presented and discussed. A WC9 class is assigned to all five stars through comparison of their spectra with those of known late-type WC stars, bringing the known total number of Galactic WC9 stars to 44. Whilst three of the five WC9 stars exhibit near-infrared (NIR) excesses characteristic of hot dust emission (as seen in the great majority of known WC9 stars), we find that two of the stars show no discernible evidence of such excesses. This increases the number of known WC9 stars without NIR excesses to seven. Reddenings and distances for all five stars are estimated.

AB - We report the discovery of five massive Wolf-Rayet (WR) stars resulting from a programme of follow-up spectroscopy of candidate emission-line stars in the Anglo-Australian Observatory United Kingdom Schmidt Telescope (AAO/UKST) Southern Galactic Plane Hα survey. The 6195-6775 Å spectra of the stars are presented and discussed. A WC9 class is assigned to all five stars through comparison of their spectra with those of known late-type WC stars, bringing the known total number of Galactic WC9 stars to 44. Whilst three of the five WC9 stars exhibit near-infrared (NIR) excesses characteristic of hot dust emission (as seen in the great majority of known WC9 stars), we find that two of the stars show no discernible evidence of such excesses. This increases the number of known WC9 stars without NIR excesses to seven. Reddenings and distances for all five stars are estimated.

KW - Circumstellar matter

KW - Galaxy: stellar content

KW - Stars: Wolf-Rayet

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=27344453684&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2005.09487.x

DO - 10.1111/j.1365-2966.2005.09487.x

M3 - Review article

AN - SCOPUS:27344453684

SN - 0035-8711

VL - 363

SP - 857

EP - 866

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Five WC9 stars discovered in the AAO/UKST Hα survey

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Keywords

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