Discovery of a Faint Carbon Star at High Galactic Latitude

Moody, J. W.; Gregory, S. A.; Soukup, Michael S.; Jaderlund, E.

doi:10.1086/118318

Cited by 5 publications

(1 citation statement)

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“…The few stars that do not appear in these surveys (and mostly listed in Alksnis et al (2001)), include: HG2-35 (CGCS 6480) from Moody et al (1997), found serendipitously during a search for emission line galaxies; and HG90 (CGCS 3801) from Meusinger & Brunzendorf (2001) found during a search for AGN in the fields around two Galactic globular clusters. Lee & Chen (2009) provide one, HG28.…”

Section: Othersmentioning

confidence: 99%

Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables

Huxor

Grebel

2015

Mon. Not. R. Astron. Soc.

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We assemble 121 spectroscopically-confirmed halo carbon stars, drawn from the literature, exhibiting measurable variability in the Catalina Surveys. We present their periods and amplitudes, which are used to estimate distances from period-luminosity relationships. The location of the carbon stars -and their velocities when availableallow us to trace the streams of the Sagittarius (Sgr) dwarf spheroidal galaxy. These are compared to a canonical numerical simulation of the accretion of Sgr. We find that the data match this model well for heliocentric distances of 15-50 kpc, except for a virtual lack of carbon stars in the trailing arm just north of the Galactic Plane, and there is only tentative evidence of the leading arm south of the Plane. The majority of the sample can be attributed to the Sgr accretion. We also find groups of carbon stars which are not part of Sgr; most of which are associated with known halo substructures. A few have no obvious attribution and may indicate new substructure. We find evidence that there may be a structure behind the Sgr leading stream apocentre, at ∼100 kpc, and a more distant extension to the Pisces Overdensity also at ∼100 kpc. We study a further 75 carbon stars for which no good period data could be obtained, and for which NIR magnitudes and colours are used to estimate distances. These data add support for the features found at distances beyond 100 kpc.

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Section: Othersmentioning

confidence: 99%

Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables

Huxor

Grebel

2015

Mon. Not. R. Astron. Soc.

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Infrared Emission of Carbon Stars

Groenewegen

1998

The Impact of Near-Infrared Sky Surveys on Galactic and Extragalactic Astronomy

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Investigation of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey. II. Early-Type Carbon Stars

Gigoyan

Sarkissian²,

Russeil

et al. 2015

Astrophysics

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International audienceIn this paper, second in this series, we discuss the nature of 66 faint carbon (C) stars which have been discovered by scrutinizing the plates of the First Byurakan Survey (FBS). These plates display lowresolution spectra of objects located at high Galactic latitudes and have a limiting magnitude of about V = 16. Our sample of 66 objects is part of a total of 120 stars found in the FBS and confirmed spectroscopically to be C stars. These 66 objects are those which show early-type spectra (not N-type). To better characterize these objects, medium-resolution CCD spectra were obtained and are exploited for them all, together with consideration of their 2MASS near-infrared (NIR) colors and their optical variability. First, we establish criteria for getting a spectral classification by using our medium-resolution spectra. Then, 57 objects show spectral features which are typical of CH-giants, while four can be classified as a R-type stars. Five objects in our sample are reported to be probably carbon dwarfs according to previous studies. We derive effective temperatures from photometry. Finally, the optical variability of our objects are studied by using the data of the Catalina Sky Survey (CSS). It is found that the vast majority do not display variability. However, for some of them, the phased light curve may indicate the presence of a secondary component. We estimate the detection range (in kpc) for each class of carbon stars detected in the FBS. Finally, our studies of C stars found at high galactic latitude are discussed in the context of the Gaia mission

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Discovery of a Faint Carbon Star at High Galactic Latitude

Cited by 5 publications

References 0 publications

Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables

Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables

Infrared Emission of Carbon Stars

Investigation of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey. II. Early-Type Carbon Stars

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