The ongoing pursuit of R Coronae Borealis stars: the ASAS-3 survey strikes again

@article{Tisserand2013TheOP,
  title={The ongoing pursuit of R Coronae Borealis stars: the ASAS-3 survey strikes again},
  author={P. Tisserand and G. Clayton and D. Welch and B. Pilecki and L. Wyrzykowski and D. Kilkenny},
  journal={Astronomy and Astrophysics},
  year={2013},
  volume={551}
}
Context. R Coronae Borealis stars (RCBs) are rare, hydrogen-deficient, carbon-rich supergiant variable stars that are likely the evolved merger products of pairs of CO and He white dwarfs. Only 55 RCB stars have been found in our galaxy and their distribution on the sky is weighted heavily by microlensing survey field positions. A less biased wide-area survey would enable us to test competing evolutionary scenarios, understand the population or populations that produce RCBs, and constrain their… Expand
Mining R Coronae Borealis stars from Catalina surveys
Aims. R Coronae Borealis stars (RCBs) are rare carbon stars that lack of hydrogen in their photospheresand are most likely products of white dwarf mergers. A census of RCBs can shed light on theExpand
A plethora of new R Coronae Borealis stars from a dedicated spectroscopic follow-up survey
It is increasingly suspected that R Coronae Borealis (RCB) stars - rare hydrogen-deficient and carbon-rich supergiant stars - are the product of mergers of white-dwarfs in the intermediary massExpand
R Coronae Borealis Stars in M31 from the Palomar Transient Factory
We report the discovery of R Coronae Borealis (RCB) stars in the Andromeda galaxy (M31) using the Palomar Transient Factory (PTF). RCB stars are rare hydrogen-deficient, carbon-rich supergiantExpand
Evolving R Coronae Borealis stars with mesa
The R Coronae Borealis (RCB) stars are rare hydrogen--deficient, carbon--rich supergiants. They undergo extreme, irregular declines in brightness of many magnitudes due to the formation of thickExpand
Unidentified emission features in the R Coronae Borealis star V854 Centauri
During its 2012 decline, the R Coronae Borealis star (RCB) V854 Cen was spectroscopically monitored with X-shooter on the ESO Very Large Telescope. The obscured optical and near-infrared spectrumExpand
R Coronae Borealis Stars are Viable Factories of Pre-solar Grains
We present a new theoretical estimate for the birthrate of R Coronae Borealis (RCB) stars that is in agreement with recent observational data. We find the current Galactic birthrate of RCB stars toExpand
High-resolution optical spectroscopy of the R Coronae Borealis star V532 Ophiuchi at maximum light
High-resolution optical spectra of the R Coronae Borealis (RCB) star V532 Oph at light maximum are discussed. The absolute visual magnitude M_V of the star is found to be -4.9 \pm 0.5. The elementalExpand
Variable Winds and Dust Formation in R Coronae Borealis Stars
We have observed P-Cygni and asymmetric, blue-shifted absorption profiles in the He I λ10830 lines of 12 R Coronae Borealis stars over short (1 month) and long (3 yr) timescales to look forExpand
An all-sky search for R Coronae Borealis stars in ASAS-SN
We report the discovery of 19 new R Coronae Borealis (RCB) star and DY Per candidates with light curves from the All-Sky Automated Survey for Supernovae (ASAS-SN). We examined both an existing set ofExpand
Variability in the 2MASS Calibration Fields: A Search for Transient Obscuration Events
We searched the light curves of over 40000 stars in the 2MASS calibration database, spanning approximately 4 years, for objects that have significant day long dimming events. We also searched theExpand
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New R Coronae Borealis stars discovered in OGLE-III Galactic bulge fields from their mid- and near-infrared properties
Context. An R Coronae Borealis (RCB) star is a rare type of supergiant star that is increasingly suspected to be the evolved merger product of two white dwarfs. Lately, many RCBs have been foundExpand
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We investigate the evolutionary status of four stars: V348 Sgr, DY Cen, and MV Sgr in the Galaxy and HV 2671 in the LMC. These stars have in common random deep declines in visual brightness, whichExpand
What are the R Coronae Borealis Stars
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R Coronae Borealis stars in the Galactic bulge discovered by EROS-2
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In 2007, R Coronae Borealis (R CrB) went into a historically deep and long decline. In this state, the dust acts like a natural coronagraph at visible wavelengths, allowing faint nebulosity aroundExpand
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Optical high-resolution spectra of the R Coronae Borealis star V CrA at light maximum and during minimum light are discussed. Abundance analysis confirms previous results showing that V CrA has theExpand
The MACHO Project LMC Variable Star Inventory. X. The R Coronae Borealis Stars
We report the discovery of eight new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The discovery of these new stars increases theExpand
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