A Spectroscopic Survey of a Sample of Active M Dwarfs

Mochnacki, S. W.; Gladders, Michael D.; Thomson, James Robertson; Lu, Wenxian; Ehlers, P.; Guler, Metin; Hussain, Ahsen; Kameda, Quincy; King, Karen; Mitchell, Patricia; Rowe, Jason F.; Schindler, Peter; Scott, Heather

doi:10.1086/343055

Cited by 33 publications

(38 citation statements)

References 30 publications

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“…In all four cases our spectroscopic distance estimates place these stars within or close to the 25 pc radius, in good agreement with the photometric distances predicted by Fleming. G179-055 was found to be a spectroscopic binary (Mochnacki et al 2002). Further stars from Fleming (1998), with proper motions below the NLTT proper motion limit of 0.18 arcsec/yr, will be described in Paper IV.…”

Section: A Possible New Pair That Was Rejectedmentioning

confidence: 96%

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry

Scholz

Meusinger

Jahreiß

2005

A&A

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Distance estimates based on low-resolution spectroscopy and Two Micron All Sky Survey (2MASS) J magnitudes are presented for a large sample of 322 nearby candidates from Luyten's NLTT catalogue. Mainly relatively bright (typically 7 < K s < 11) and red high proper motion stars have been selected according to their 2MASS magnitudes and optical-to-infrared colours (+1 < R − K s < +7). Some LHS stars previously lacking spectroscopy have also been included. We have classified the majority of the objects as early-M dwarfs (M 2−M 5). More than 70% of our targets turned out to lie within the 25 pc horizon of the catalogue of nearby stars, with 50 objects placed within 15 pc and 8 objects being closer than 10 pc. Three objects in the 10 pc sample have no previously published spectral type: LP 876-10 (M 4), LP 870-65 (M 4.5), and LP 869-26 (M 5). A large fraction of the objects in our sample (57%) have independent distance estimates, mainly by the recent efforts of Reid and collaborators. Our distance determinations are generally in good agreement with theirs. 11 rather distant (d > 100 pc) objects have also been identified, including a probable halo, but relatively hot (T eff ∼ 13 000 K) white dwarf (LHS 1200) and 10 red dwarfs with extremely large tangential velocities (250 < v t < 1150 km s −1 ). Altogether, there are 11 red dwarfs (including one within 70 pc) with tangential velocities larger than about 250 km s −1 . All these objects are suspected to be in fact subdwarfs, if so, their distances would be only about half of our original estimates. The three most extreme objects in that respect are the K and early M dwarfs LP 323-168, LHS 5343 and LP 552-21 with corrected distances between 180 pc and 400 pc and resulting tangential velocities still larger than about 400 km s −1 .

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Section: A Possible New Pair That Was Rejectedmentioning

confidence: 96%

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry

Scholz

Meusinger

Jahreiß

2005

A&A

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“…In this paper we investigate the correlation of activity and rotation for these two samples separately and refer to them as the Volume7 and the Volume14 samples in the text. Griffin et al (1985); Hartmann et al (1987); Hartmann & Stauffer (1989); Rodrìguez (2014); Houdebine (2010Houdebine ( , 2012; Jenkins et al (2009);López-Santiago et al (2010); Malo et al (2014a); Marcy & Chen (1992); Mochnacki et al (2002); Mohanty & Basri (2003); Morales et al (2009);Reid et al (2002); Schlieder et al (2010Schlieder et al ( , 2012a; Stauffer & Hartmann (1986); Stauffer et al (1997);Tokovinin (1992) two subsamples as a function of spectral type is shown in the right-hand panel of Figure 1.…”

Section: Samplesmentioning

confidence: 98%

CARMENES input catalogue of M dwarfs

Jeffers

Schöfer

Lamert

et al. 2018

A&A

134

141

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CARMENES is a spectrograph for radial velocity surveys of M dwarfs with the aim of detecting Earth-mass planets orbiting in the habitable zones of their host stars. To ensure an optimal use of the CARMENES Guaranteed Time Observations, in this paper we investigate the correlation of activity and rotation for approximately 2200 M dwarfs, ranging in spectral type from M0.0 V to M9.0 V. We present new high-resolution spectroscopic observations with FEROS, CAFE, and HRS of approximately 500 M dwarfs. For each new observation, we determined its radial velocity and measured its Hα activity index and its rotation velocity. Additionally, we have multiple observations of many stars to investigate if there are any radial velocity variations due to multiplicity. The results of our survey confirm that early-M dwarfs are Hα inactive with low rotational velocities and that late-M dwarfs are Hα active with very high rotational velocities. The results of this high-resolution analysis comprise the most extensive catalogue of rotation and activity in M dwarfs currently available.

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“…(a) Some other publications and meta-archives that we have searched for potential CARMENES targets are Kirkpatrick et al (1991), Gizis (1997), Gizis & Reid (1997), Gizis et al (2000b), Henry et al (2002Henry et al ( , 2006, Mochnacki et al (2002), Gray et al (2003), Bochanski et al (2005), Crifo et al (2005), Lodieu et al (2005), Scholz et al (2005), Phan-Bao & Bessell (2006), Reylé et al (2006), Riaz et al (2006), Caballero (2007Caballero ( , 2009Caballero ( , 2012, Gatewood & Coban (2009), Shkolnik et al (2009, 2012, Bergfors et al (2010), Johnson et al (2010), Boyd et al (2011), Irwin et al (2011), West et al (2011, Avenhaus et al (2012), Deacon et al (2012), Janson et al (2012, 2014), Frith et al (2013, Jódar et al (2013), Malo et al (2013), Aberasturi et al (2014), Dieterich et al (2014), Riedel et al (2014), Yi et al (2014), , and the DwarfArchive at http://dwarfarchive.org. (b) PMSU: Reid et al (1995Reid et al ( , 2002; Hawley et al (1996); Gizis et al (2002).…”

Section: Carmenes Samplementioning

confidence: 99%

CARMENES input catalogue of M dwarfs

Alonso-Floriano¹,

Morales²,

Caballero³

et al. 2015

A&A

186

178

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Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It is optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare a list of the brightest, single M dwarfs in each spectral subtype observable from the northern hemisphere, from which we will select the best planet-hunting targets for CARMENES. Methods. In this first paper on the preparation of our input catalogue, we compiled a large amount of public data and collected lowresolution optical spectroscopy with CAFOS at the 2.2 m Calar Alto telescope for 753 stars. We derived accurate spectral types using a dense grid of standard stars, a double least-squares minimisation technique, and 31 spectral indices previously defined by other authors. Additionally, we quantified surface gravity, metallicity, and chromospheric activity for all the stars in our sample. Results. We calculated spectral types for all 753 stars, of which 305 are new and 448 are revised. We measured pseudo-equivalent widths of Hα for all the stars in our sample, concluded that chromospheric activity does not affect spectral typing from our indices, and tabulated 49 stars that had been reported to be young stars in open clusters, moving groups, and stellar associations. Of the 753 stars, two are new subdwarf candidates, three are T Tauri stars, 25 are giants, 44 are K dwarfs, and 679 are M dwarfs. Many of the 261 investigated dwarfs in the range M4.0-8.0 V are among the brightest stars known in their spectral subtype. Conclusions. This collection of low-resolution spectroscopic data serves as a candidate target list for the CARMENES survey and can be highly valuable for other radial-velocity surveys of M dwarfs and for studies of cool dwarfs in the solar neighbourhood.

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A Spectroscopic Survey of a Sample of Active M Dwarfs

Cited by 33 publications

References 30 publications

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry

CARMENES input catalogue of M dwarfs

CARMENES input catalogue of M dwarfs

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