V and Rc light curves of medium-bright PPNe Virtual Observatory Resource

Authors
  1. Hrivnak B.J.
  2. Henson G.
  3. Hillwig T.C.
  4. Lu W.
  5. Murphy B.W.
  6. Kaitchuck R.H.
  7. Published by
    CDS
Abstract

We present 10 years of new photometric monitoring of the light variability of five evolved stars with strong mid-infrared emission from surrounding dust. Three are known carbon-rich proto-planetary nebulae (PPNe) with F-G spectral types; the nature of the other two was previously unknown. For the three PPNe, we determine or refine the pulsation periods of IRAS04296+3429 (71 days), 06530-0213 (80 days), and 23304+6147 (84 days). A secondary period was found for each, with a period ratio P_2_/P_1_ of 0.9. The light variations are small, 0.1-0.2mag. These are similar to values found in other PPNe. The other two are found to be giant stars. IRAS09296+1159 pulsates with a period of only 47 days but reaches pulsational light variations of 0.5mag. Supplemental spectroscopy reveals the spectrum of a CH carbon star. IRAS08359-1644 is a G1III star that does not display pulsational variability; rather, it shows nonperiodic decreases of brightness of up to 0.5mag over this 10 year interval. These drops in brightness are reminiscent of the light curves of R Corona Borealis variables, but with much smaller decreases in brightness and are likely due to transient dust obscuration. Its spectral energy distribution is very similar to that of the unusual oxygen-rich giant star HDE233517, which possesses mid-infrared hydrocarbon emission features. These two non-PPNe turn out to be members of the rare group of giant stars with large mid-infrared excesses due to dust, objects which presumably have interesting evolutionary histories.

Keywords
  1. Infrared photometry
  2. Optical astronomy
  3. Photometry
  4. Planetary nebulae
  5. Carbon stars
  6. Giant stars
Bibliographic source Bibcode
2020AJ....159...21H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/21
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/159/21
Document Object Identifer DOI
doi:10.26093/cds/vizier.51590021

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/21
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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/21
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https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/21/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/21/table1?

History

2020-03-23T11:59:19Z
Resource record created
2020-03-23T11:59:19Z
Created
2020-08-20T12:52:49Z
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