The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk. Ii. The Field

Bochanski, John J.; Hawley, Suzanne L.; Covey, Kevin R.; West, Andrew A.; Reid, I. Neill; Golimowski, D. A.; Ivezić, Željko

doi:10.1088/0004-6256/139/6/2679

Cited by 322 publications

(326 citation statements)

References 134 publications

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“…For low-mass stars, the SDSS has produced photometric and spectroscopic samples of more than 30 million and 70,000 M dwarfs respectively (Bochanski et al 2010;West et al 2011). Low-mass stars in SDSS have been used as tracers of Galactic dynamics (Bochanski et al 2007Fuchs et al 2009) and Galactic extinction (Jones et al 2011) and to investigate several aspects of the stars themselves, including but not limited to, the stellar mass and luminosity functions (Covey et al 2008b;Bochanski et al 2010), properties of magnetic activity (West et al 2004(West et al , 2008, and the low-metallicity population of the Galactic disk (Savcheva et al 2014).…”

Section: Datamentioning

confidence: 99%

“…To measure optical stellar activity, the catalog includes (among other quantities) fractional Hα luminosities (L Ha L bol ) for each star in the sample and the magnetic (Hα) activity state of each star (with "active" and "inactive" flags). Distances were measured for all stars using the photometric parallax technique described in Bochanski et al (2010) and corrected for dust (Jones et al 2011), and have an accuracy of ∼18%. These uncertainties are distance-independent, as they result from photometric parallaxes and are dominated by variance in the M dwarf luminosity function.…”

Section: Datamentioning

confidence: 99%

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A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

Jones¹,

West²

2016

ApJ

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We present a catalog of Galaxy Evolution Explorer Near-UV (NUV) and Far-UV (FUV) photometry for the Palomar/MSU and SDSS DR7 spectroscopic M dwarf catalogs. The catalog contains NUV measurements matched to 577 spectroscopically confirmed M dwarfs and FUV measurements matched to 150 spectroscopically confirmed M dwarfs. Using these data, we find that NUV and FUV luminosities strongly correlate with Hα emission, a typical indicator of magnetic activity in M dwarfs. We also examine the fraction of M dwarfs with varying degrees of strong line emission at NUV wavelengths. Our results indicate that the frequency of M dwarf NUV emission peaks at intermediate spectral types, with at least ∼30% of young M4-M5 dwarfs having some level of activity. For mid-type M dwarfs, we show that NUV emission decreases with distance from the Galactic plane, a proxy for stellar age. Our complete matched source catalog is available online.

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Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

Jones¹,

West²

2016

ApJ

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“…Photometric distances were calculated using the colourabsolute magnitude relations given in Bochanski et al (2010;Table 4) for M0-M9 dwarfs. We used the Mr − (r − z) relationship whenever possible and Mr − (r − i) or Mr − (i − z) otherwise.…”

Section: Distancesmentioning

confidence: 99%

Discovery of wide low and very low-mass binary systems using Virtual Observatory tools

Gálvez-Ortiz

Solano

Lodieu

et al. 2016

Mon. Not. R. Astron. Soc.

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The frequency of multiple systems and their properties are key constraints of stellar formation and evolution. Formation mechanisms of very low-mass (VLM) objects are still under considerable debate and an accurate assessment of their multiplicity and orbital properties are essential for constraining current theoretical models.Taking advantage of the Virtual Observatory capabilities, we looked for comoving low and VLM binary (or multiple) systems using the Large Area Survey of the UKIDSS LAS DR10, SDSS DR9, and the 2MASS Catalogues. Other catalogues (W ISE, GLIMPSE, SuperCosmos ...) were used to derive the physical parameters of the systems.We report the identification of 36 low and VLM (∼M0-L0 spectral types) candidates to binary/multiple system (separations between 200 and 92000 AU), whose physical association is confirmed through common proper motion, distance and low probability of chance alignment. This new system list notably increases the previous sampling in their mass-separation parameter space (∼100). We have also found 50 low-mass objects that we can classify as ∼L0-T2 according to their photometric information. Only one of these objects presents a common proper motion high-mass companion.Although we could not constrain the age of the majority of the candidates, probably most of them are still bound except four that may be under disruption processes. We suggest that our sample could be divided in two populations: one tightly bound wide VLM systems that are expected to last more than 10 Gyr, and other formed by weak bound wide VLM systems that will dissipate within a few Gyrs.

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“…This is equivalent to dereddening to the M dwarf locus in the (g − r, r − i) colour-colour diagram. The reddening coefficients used are those of Schlafly et al (2010) and photometric parallaxes are determined following Bochanski et al (2010). A simple profile model, consisting of a single step function convolved with a Gaussian (to model errors in the determination of distance modulus), is fit to the derived E(B − V) and distance values.…”

Section: Distances From Sdssmentioning

confidence: 99%

Planckearly results. XXIII. The first all-sky survey of Galactic cold clumps

Ade¹,

Aghanim²,

Arnaud³

et al. 2011

A&A

154

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We present the statistical properties of the Cold Clump Catalogue of Planck Objects (C3PO), the first all-sky catalogue of cold objects, in terms of their spatial distribution, dust temperature, distance, mass, and morphology. We have combined Planck and IRAS data to extract 10 342 cold sources that stand out against a warmer environment. The sources are distributed over the whole sky, including in the Galactic plane, despite the confusion, and up to high latitudes (>30 • ). We find a strong spatial correlation of these sources with ancillary data tracing Galactic molecular structures and infrared dark clouds where the latter have been catalogued. These cold clumps are not isolated but clustered in groups. Dust temperature and emissivity spectral index values are derived from their spectral energy distributions using both Planck and IRAS data. The temperatures range from 7 K to 19 K, with a distribution peaking around 13 K. The data are inconsistent with a constant value of the associated spectral index β over the whole temperature range: β varies from 1.4 to 2.8, with a mean value around 2.1. Distances are obtained for approximately one third of the objects. Most of the detections lie within 2 kpc of the Sun, but more distant sources are also detected, out to 7 kpc. The mass estimates inferred from dust emission range from 0.4 M to 2.4 × 10 5 M . Their physical properties show that these cold sources trace a broad range of objects, from low-mass dense cores to giant molecular clouds, hence the "cold clump" terminology. This first statistical analysis of the C3PO reveals at least two colder populations of special interest with temperatures in the range 7 to 12 K: cores that mostly lie close to the Sun; and massive cold clumps located in the inner Galaxy. We also describe the statistics of the early cold core (ECC) sample that is a subset of the C3PO, containing only the 915 most reliable detections. The ECC is delivered as a part of the Planck Early Release Compact Source Catalogue (ERCSC).

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The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk. Ii. The Field

Cited by 322 publications

References 134 publications

A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

Discovery of wide low and very low-mass binary systems using Virtual Observatory tools

Planckearly results. XXIII. The first all-sky survey of Galactic cold clumps

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