Star formation in the Cepheus Flare region - II. A-type stars associated with IRAS sources

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Abstract

In order to reveal the star-forming history of the molecular cloud complex we studied the intermediate mass stellar population in the Cepheus Flare region. (Paper I dealt with the distance and the young stellar object candidates of the region.) Correlating the IRAS Point Source Catalogue and Faint Source Catalogue positions with those of 1214 B8-A8 and 1760 F0-F5 type stars brighter than V ≈ 13 mag and classified during an objective prism survey, we identified 19 stars showing far-infrared excess emission in the Cepheus Flare region. In addition to the 16 stars whose counterparts are given in the IRAS catalogues, we found three more stars with infrared excess not recognized before. In order to identify the young medium-mass stars associated with the Cepheus Flare molecular clouds we observed the optical spectra of the IR-excess stars, and using published optical photometry and the IRAS data we examined their spectral energy distributions (SEDs) and IRAS two-colour diagram. The observations resulted in the discovery of a new Herbig Ae/Be star, BD +68°1118, coinciding with IRAS 21169+6842. More evolved HAe/Be stars may be SAO 19953, BD +67°1314 and BD +69°1231, whose Hα lines showed weak emission components. Possible β Pictoris-or Vega-type stars may be HD 203854, HD 212826 and HD 216486, whereas the far-infrared fluxes at the positions of BD +72°1018, HD 210806 and HD 217903 can be attributed to the heating of the interstellar environment. We used distances and radial velocities of the stars derived from the spectroscopy and published optical photometry as icators of their relations to the clouds. Information on the environment of the observed stars deduced from the diffuse interstellar band at λ6613 is briefly discussed.

Original languageEnglish
Pages (from-to)777-790
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume319
Issue number3
Publication statusPublished - Dec 11 2000

Fingerprint

Infrared Astronomy Satellite
flares
star formation
stars
mass media
point source
diagram
spectroscopy
heating
catalogs
history
molecular clouds
photometry
energy
diffuse interstellar bands
H lines
young
spectral energy distribution
stellar mass
radial velocity

Keywords

  • Circumstellar matter
  • Open clusters and associations: individual: Cepheus R2
  • Stars: early-type
  • Stars: formation

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

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title = "Star formation in the Cepheus Flare region - II. A-type stars associated with IRAS sources",
abstract = "In order to reveal the star-forming history of the molecular cloud complex we studied the intermediate mass stellar population in the Cepheus Flare region. (Paper I dealt with the distance and the young stellar object candidates of the region.) Correlating the IRAS Point Source Catalogue and Faint Source Catalogue positions with those of 1214 B8-A8 and 1760 F0-F5 type stars brighter than V ≈ 13 mag and classified during an objective prism survey, we identified 19 stars showing far-infrared excess emission in the Cepheus Flare region. In addition to the 16 stars whose counterparts are given in the IRAS catalogues, we found three more stars with infrared excess not recognized before. In order to identify the young medium-mass stars associated with the Cepheus Flare molecular clouds we observed the optical spectra of the IR-excess stars, and using published optical photometry and the IRAS data we examined their spectral energy distributions (SEDs) and IRAS two-colour diagram. The observations resulted in the discovery of a new Herbig Ae/Be star, BD +68°1118, coinciding with IRAS 21169+6842. More evolved HAe/Be stars may be SAO 19953, BD +67°1314 and BD +69°1231, whose Hα lines showed weak emission components. Possible β Pictoris-or Vega-type stars may be HD 203854, HD 212826 and HD 216486, whereas the far-infrared fluxes at the positions of BD +72°1018, HD 210806 and HD 217903 can be attributed to the heating of the interstellar environment. We used distances and radial velocities of the stars derived from the spectroscopy and published optical photometry as icators of their relations to the clouds. Information on the environment of the observed stars deduced from the diffuse interstellar band at λ6613 is briefly discussed.",
keywords = "Circumstellar matter, Open clusters and associations: individual: Cepheus R2, Stars: early-type, Stars: formation",
author = "M. Kun and J. Vink{\'o} and L. Szabados",
year = "2000",
month = "12",
day = "11",
language = "English",
volume = "319",
pages = "777--790",
journal = "Monthly Notices of the Royal Astronomical Society",
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TY - JOUR

T1 - Star formation in the Cepheus Flare region - II. A-type stars associated with IRAS sources

AU - Kun, M.

AU - Vinkó, J.

AU - Szabados, L.

PY - 2000/12/11

Y1 - 2000/12/11

N2 - In order to reveal the star-forming history of the molecular cloud complex we studied the intermediate mass stellar population in the Cepheus Flare region. (Paper I dealt with the distance and the young stellar object candidates of the region.) Correlating the IRAS Point Source Catalogue and Faint Source Catalogue positions with those of 1214 B8-A8 and 1760 F0-F5 type stars brighter than V ≈ 13 mag and classified during an objective prism survey, we identified 19 stars showing far-infrared excess emission in the Cepheus Flare region. In addition to the 16 stars whose counterparts are given in the IRAS catalogues, we found three more stars with infrared excess not recognized before. In order to identify the young medium-mass stars associated with the Cepheus Flare molecular clouds we observed the optical spectra of the IR-excess stars, and using published optical photometry and the IRAS data we examined their spectral energy distributions (SEDs) and IRAS two-colour diagram. The observations resulted in the discovery of a new Herbig Ae/Be star, BD +68°1118, coinciding with IRAS 21169+6842. More evolved HAe/Be stars may be SAO 19953, BD +67°1314 and BD +69°1231, whose Hα lines showed weak emission components. Possible β Pictoris-or Vega-type stars may be HD 203854, HD 212826 and HD 216486, whereas the far-infrared fluxes at the positions of BD +72°1018, HD 210806 and HD 217903 can be attributed to the heating of the interstellar environment. We used distances and radial velocities of the stars derived from the spectroscopy and published optical photometry as icators of their relations to the clouds. Information on the environment of the observed stars deduced from the diffuse interstellar band at λ6613 is briefly discussed.

AB - In order to reveal the star-forming history of the molecular cloud complex we studied the intermediate mass stellar population in the Cepheus Flare region. (Paper I dealt with the distance and the young stellar object candidates of the region.) Correlating the IRAS Point Source Catalogue and Faint Source Catalogue positions with those of 1214 B8-A8 and 1760 F0-F5 type stars brighter than V ≈ 13 mag and classified during an objective prism survey, we identified 19 stars showing far-infrared excess emission in the Cepheus Flare region. In addition to the 16 stars whose counterparts are given in the IRAS catalogues, we found three more stars with infrared excess not recognized before. In order to identify the young medium-mass stars associated with the Cepheus Flare molecular clouds we observed the optical spectra of the IR-excess stars, and using published optical photometry and the IRAS data we examined their spectral energy distributions (SEDs) and IRAS two-colour diagram. The observations resulted in the discovery of a new Herbig Ae/Be star, BD +68°1118, coinciding with IRAS 21169+6842. More evolved HAe/Be stars may be SAO 19953, BD +67°1314 and BD +69°1231, whose Hα lines showed weak emission components. Possible β Pictoris-or Vega-type stars may be HD 203854, HD 212826 and HD 216486, whereas the far-infrared fluxes at the positions of BD +72°1018, HD 210806 and HD 217903 can be attributed to the heating of the interstellar environment. We used distances and radial velocities of the stars derived from the spectroscopy and published optical photometry as icators of their relations to the clouds. Information on the environment of the observed stars deduced from the diffuse interstellar band at λ6613 is briefly discussed.

KW - Circumstellar matter

KW - Open clusters and associations: individual: Cepheus R2

KW - Stars: early-type

KW - Stars: formation

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