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Title: Are DY Persei Stars Cooler Cousins of R Coronae Borealis Stars?
Authors: Bhowmick, A
Pandey, G
Joshi, V
Ashok, N. M
Keywords: Infrared: stars;Stars: carbon;Stars: evolution;Stars: variables: general;Supergiants
Issue Date: 20-Feb-2018
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 854, No. 2, 140
Abstract: In this paper we present, for the first time, the study of low resolution H- and K-band spectra of 7 DY Per type and suspect stars, as well as DY Persei itself. We also observed H- and K-band spectra of 3 R Coronae Borealis (RCB) stars, 1 hydrogen-deficient carbon (HdC) star, and 14 cool carbon stars, including normal giants as comparisons. High 12C/13C and low 16O/18O ratios are characteristic features of majority RCBs and HdCs. We have estimated 16O/18O ratios of the program stars from the relative strengths of the 12C16O and 12C18O molecular bands observed in K-band. Our preliminary analysis suggests that a quartet of the DY Per suspects, along with DY Persei itself, seem to show isotopic ratio strength consistent with that of RCB/HdC stars, whereas two of them do not show significant 13C and 18O in their atmospheres. Our analysis provides further indications that DY Per type stars could be related to the RCB/HdC class of stars.
Description: Restricted Access
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
Appears in Collections:IIAP Publications

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