Iris photometry near southern Cepheids. V. AQ Pup Virtual Observatory Resource

Authors
  1. Turner D.G.
  2. van den Bergh S.
  3. Younger P.F.
  4. Majaess D.J.
  5. Pedreros M.H.,Berdnikov L.N.
  6. Published by
    CDS
Abstract

A photometric UBV survey is presented for 610 stars in a region surrounding the Cepheid AQ Puppis and centered southwest of the variable, based upon photoelectric measures for 14 stars and calibrated iris photometry of photographic plates of the field for 596 stars. An analysis of reddening and distance for program stars indicates that the major dust complex in this direction is ~1.8kpc distant, producing differential extinction described by a ratio of total-to-selective extinction of R=A_V_/E_B-V_=3.10+/-0.20. Zero-age main-sequence fitting for the main group of B-type stars along the line of sight yields a distance of 3.21+/-0.19kpc (V_0_-M_V_=12.53+/-0.13s.e.). The 29.97 Cepheid AQ Pup, of field reddening E_B-V_=0.47+/-0.07 (E_B-V_(B0)=0.51+/-0.07), appears to be associated with B-type stars lying within 5' of it as well as with a sparse group of stars, designated Turner 14, centered south of it at J2000.0=07:58:37, -29:25:00, with a mean reddening of E_B-V_=0.81+/-0.01. AQ Pup has an inferred luminosity as a cluster member of <M_V_>=-5.40+/-0.25 and an evolutionary age of 3x10^7^yr. Its observed rate of period increase of +300.1+/-1.2s/yr is an order of magnitude larger than what is observed for Cepheids of comparable period in the third crossing of the instability strip, and may be indicative of a high rate of mass loss or a putative fifth crossing. Another sparse cluster, designated Turner 13, surrounds the newly recognized 2.59 Cepheid V620 Pup, of space reddening E_B-V_=0.64+/-0.02 (E_B-V_(B0)=0.68+/-0.02), distance 2.88+/-0.11kpc (V_0_-M_V_=12.30+/-0.08s.e.), evolutionary age 10^8^yr, and an inferred luminosity as a likely cluster member of <M_V_>=-2.74+/-0.11. V620 Pup is tentatively identified as a first crosser, pending additional observations.

Keywords
  1. Variable stars
  2. Optical astronomy
  3. Wide-band photometry
  4. Photographic photometry
Bibliographic source Bibcode
2012AJ....144..187T
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/187
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/144/187
Document Object Identifer DOI
doi:10.26093/cds/vizier.51440187

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/187
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/187
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/187
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/187/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/187/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/187/table2?

History

2014-02-10T10:10:40Z
Resource record created
2014-02-10T10:10:40Z
Created
2014-02-27T14:18:20Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr