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New DENIS nearby L and late-M dwarfs
We report on new nearby L and late-M dwarfs (d_phot_<=30pc) discovered in our search for nearby ultracool dwarfs (I-J>=3.0, later than M8.0) in the Galactic plane... -
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... -
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... -
Search for nearby earth analogs. II. RV analysis.
Zechmeister et al. (2009, J/A+A/505/859) surveyed 38 nearby M dwarfs from 2000 to 2007 March with VLT2 and the Ultraviolet and Visual Echelle Spectrograph (UVES) spectrometer.... -
M-type stars in LAMOST DR5
We present new catalogs of M giant and M dwarf stars from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 5 (DR5). In total, 39796 M giants... -
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... -
Orbital monitoring of AstraLux binaries
Orbital monitoring of M-type binaries is essential for constraining their fundamental properties. This is particularly useful in young systems, where the extended... -
HARPS-TERRA project. I.
Doppler spectroscopy has uncovered or confirmed all the known planets orbiting nearby stars. Two main techniques are used to obtain precision Doppler measurements at optical... -
UBVRIJHK color-temperature calibration
A collection of Johnson/Cousins photometry for stars with known [Fe/H] is used to generate color-color relations that include the abundance dependence. Literature temperature... -
Optical photometry of the ONC
We present U, B, V, I broadband, 6200{AA} TiO medium band, and H{alpha} narrow band photometry of the Orion Nebula Cluster (ONC) obtained with the WFI imager at the ESO/MPI 2.2... -
Chemical properties of the local disk & halo. II.
We present a model-fit pipeline to determine the stellar parameters of M-type dwarfs, which is an improvement on our previous work described in Hejazi+ (Paper I; J/AJ/159/30).... -
Beyond the local volume. I. HST ultracool dwarfs
Ultracool dwarf stars and brown dwarfs provide a unique probe of large-scale Galactic structure and evolution; however, until recently spectroscopic samples of sufficient size,... -
K2 rotation periods for SDSS & Gaia M dwarfs
In this work we examine M dwarf rotation rates at a range of ages to establish benchmarks for M dwarf gyrochronology. This work includes a sample of 713 spectroscopically... -
Kepler and XMM LCs of 3 KIC stars with flares
Solar and stellar flares are powerful events that produce intense radiation across the electromagnetic spectrum. Multiwavelength observations are highly important for... -
R-band LC and spectrum of a superstellar flare
We report the detection and follow-up of a superstellar flare GWAC181229A with an amplitude of {Delta}R~9.5mag on an M9-type star by SVOM/GWAC and the dedicated follow-up...
