H{alpha} emission stars in IC 1274 Virtual Observatory Resource

Authors
  1. Dahm S.E.
  2. Herbig G.H.
  3. Bowler B.P.
  4. Published by
    CDS
Abstract

IC 1274 is a faintly luminous nebula lying on the near surface of the Lynds 227 (L227) molecular cloud. Its cavity-like morphology is reminiscent of a blistered star-forming region. Four luminous, early-type (B0-B5) stars are located within a spherical volume ~5' in diameter that appears to be clear of heavy obscuration. Approximately centered in the cleared region is the B0 V star HD 166033, which is thought to be largely responsible for the cavity's excavation. Over 80 H{alpha} emission sources brighter than V~21 have been identified in the region. More than half of these are concentrated in IC 1274 and are presumably members of a faint T Tauri star population. Chandra Advanced CCD Imaging Spectrometer imaging of a nearby suspected pulsar and time-variable {gamma}-ray source (GeV J1809-2327) detected 21 X-ray sources in the cluster vicinity, some of which are coincident with the early-type stars and H{alpha} emitters in IC 1274. Deep (V~22) optical BVRI photometry has been obtained for the cluster region. A distance of 1.82+/-0.3kpc and a mean extinction of AV~1.21+/-0.2mag follow from photometry of the early-type stars. Using pre-main-sequence evolutionary models, we derive a median age for the H{alpha} emitters and X-ray sources of ~1Myr; however, a significant dispersion is present. The displaced material was driven against what remains of the molecular cloud to the east, enabling the formation of the substantial number of T Tauri stars found there. A dispersed population of H{alpha} emitters is also found along the periphery of L227, IC 1275, and IC 4684.

Keywords
  1. infrared-photometry
  2. visible-astronomy
  3. Wide-band photometry
  4. emission-line-stars
  5. line-intensities
  6. h-alpha-photometry
  7. stellar-associations
Bibliographic source Bibcode
2012AJ....143....3D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/3
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/143/3
Document Object Identifer DOI
doi:10.26093/cds/vizier.51430003

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History

2013-04-05T13:51:48Z
Resource record created
2013-04-05T13:51:48Z
Created
2018-01-05T08:57:02Z
Updated

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