A CATALOG OF ROTATION AND ACTIVITY IN EARLY-M STARS
By A. Reiners, N. Joshi, B. Goldman. 2012
139 citations recorded by the source corpus.
We present a catalog of rotation and chromospheric activity in a sample of 334 M dwarfs of spectral types M0–M4.5 populating the parameter space around the boundary to full convection. We obtain high-resolution optical spectra for 206 targets and determine projected rotational velocity, vsin i, and Hα emission. The data are combined with measurements of vsin i in field stars of the same spectral type from the literature. Our sample adds 157 new rotation measurements to the existing literature and almost doubles the sample of available vsin i. The final sample provides a statistically meaningful picture of rotation and activity at the transition to full convection in the solar neighborhood. We confirm a steep rise in the fraction of active stars at the transition to full convection known from earlier work. In addition, we see a clear rise in rotational velocity in the same stars. In very few stars, no chromospheric activity but a detection of rotational broadening is reported. We argue that all of them are probably spurious detections; we conclude that in our sample all significantly rotating stars are active, and all active stars are significantly rotating. The rotation–activity relation is valid in partially and in fully convective stars. Thus, we do not observe any evidence for a transition from a rotationally dominated dynamo in partially convective stars to a rotation-independent turbulent dynamo in fully convective stars; turbulent dynamos in fully convective stars of spectral types around M4 are still driven by rotation. Finally, we compare projected rotational velocities of 33 stars to rotational periods derived from photometry in the literature and determine inclinations for a few of them.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/11426259f0573717207d9b269861ed74a3133c8e
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Statistical and Nonlinear Physics
Citations in the corpus
- THE Hα EMISSION OF NEARBY M DWARFS AND ITS RELATION TO STELLAR ROTATION (2016, methodology): “For rapidly rotating stars, Hα emission maintains a saturated value, as seen in many previous works (Delfosse et al. 1998; Mohanty & Basri 2003; Reiners et al. 2012; Douglas et al. 2014).”
- HOW THERMAL EVOLUTION AND MASS-LOSS SCULPT POPULATIONS OF SUPER-EARTHS AND SUB-NEPTUNES: APPLICATION TO THE KEPLER-11 SYSTEM AND BEYOND (2012, background): “Likewise, it is also important get more observations of XUV fluxes and flares from M dwarfs, which are known to be highly active (Reiners et al. 2012).”
- Observations of Cool-Star Magnetic Fields (2012, background): “It is well known that early-M dwarfs (M0 – M3) in the field are generally much less active and slower-rotating than later, fully convective M stars (e.g., Delfosse et al., 1998; Reiners and Basri, 2008; Reiners et al., 2012).”
- Rotation periods of 12 000 main-sequence Kepler stars: Dependence on stellar spectral type and comparison with v sin i observations (2013, methodology): “Our sample contains 795 M-type stars, where ∼15% L10, page 3 of 4 have periods less than 7.5 days; i.e., these are potentially fastrotating, fully convective M-type dwarfs, such as those found by Reiners et al. (2012).”
- Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators (2017, background): “5 dwarf with significant rotation measured in several works (v sin i ∼ 5 km s−1, log(LHα/Lbol) = −3.48; Reiners et al. 2012; Jeffers et al. 2017), a photometric period of 2.78 d (West et al. 2015), an average magnetic field of the order of 3–4 kG, and local field strengths up to 7 kG (Shulyak et…”