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UV/X-ray activity of M dwarfs within 10pc
M dwarfs are the most numerous stars in the Galaxy. They are characterized by strong magnetic activity. The ensuing high-energy emission is crucial for the evolution of their... -
CaII and H{alpha} data for dK5/dM4 stars
We use 665 high-resolution spectra for 60 different dM4 stars and 1088 high-resolution spectra for 97 different dK5 stars from the European Southern Observatory (ESO) and... -
Fast-rotating M-dwarf stars in NGC 2547
At fast rotation rates, the coronal activity of G- and K-type stars has been observed to "saturate" and then decline again at even faster rotation rates - a phenomenon dubbed... -
Fast-rotating M dwarfs in NGC2516
We report radial velocities (RVs), projected equatorial velocities (vsini) and CaII triplet (CaT) chromospheric activity indices for 237 late-K to mid-M candidate members of the... -
Polarisation of a sample of late M dwarfs
We present here the final results of the first spectropolarimetric survey of a small sample of active M dwarfs, aimed at providing observational constraints on dynamo action on... -
Light curves of 261 nearby pulsating M giants
We present the results of a 5.5-yr CCD photometric campaign that monitored 261 bright, southern, semiregular variables (SRVs) with relatively precise Hipparcos parallaxes. The... -
Magnetic field and velocity of mid M dwarfs
We present in this paper, the first results of a spectropolarimetric analysis of a small sample (~20) of active stars ranging from spectral type M0 to M8, which are either fully... -
Magnetic field and velocity of early M dwarfs
We present here additional results of a spectropolarimetric survey of a small sample of stars ranging from spectral type M0 to M8 aimed at investigating observationally how... -
Fundamental parameters of M dwarfs
We empirically determine effective temperatures and bolometric luminosities for a large sample of nearby M dwarfs, for which high accuracy optical and infrared photometry is... -
M giants in MACHO, DENIS and ISOGAL
A 'complete' sample of 174 M giants classified in the mid-1980s by Blanco (1986AJ.....91..290B) and later than subtype M0 in the NGC 6522 Baade's Window clear field has been... -
UBV(RI)_c_ photometry of HIP red stars
We present homogeneous and standardized UBV(RI)c photometry for nearly 550 M stars selected from the Hipparcos satellite data base (Cat. ) using the following selection... -
Abundances in gamma Sge
CCD spectra are used to analyse the abundances of chemical elements in the atmosphere of the MOIII giant gamma Sagittae. Its atmospheric atmospheric parameters were determined... -
LAMOST DR9 M-giant stars value-added cat.
In this work, we update the catalog of M-giant stars from the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 9.... -
Stellar parameters of M-type stars from LAMOST DR8
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low Resolution Spectroscopic Survey (LRS) provides massive spectroscopic data on M-type stars, and the... -
Halpha and other EWs of LAMOST M-type stars
We have used the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) low-resolution and medium-resolution spectroscopic surveys to explore the chromospheric... -
Search for nearby Earth analogs. III. RV sets
Earth-sized planets in the habitable zones of M dwarfs are good candidates for the study of habitability and detection of biosignatures. To search for these planets, we analyze... -
M-type star magnetic activities from LAMOST & Kepler
We performed a statistical study of magnetic activities of M-type stars by combining the spectra of LAMOST DR5 with light curves from the Kepler and K2 missions. We mainly want... -
M-subdwarf research. I. LAMOST DR4 spectra obs.
We propose a revision of the system developed by Lepine+ (2007ApJ...669.1235L) for spectroscopic M-subdwarf classification. Based on an analysis of subdwarf spectra and... -
SpeX NIR survey of 886 nearby M dwarfs
We present a catalog of near-infrared (NIR) spectra and associated measurements for 886 nearby M dwarfs. The spectra were obtained with the NASA-Infrared Telescope Facility SpeX... -
Planets Around Low-Mass Stars (PALMS). IV.
We present results from a high-contrast adaptive optics imaging search for giant planets and brown dwarfs (>~1M_Jup_) around 122 newly identified nearby (<~40pc) young M...
