J/A+A/556/A15 Effective temperature scale of M dwarfs (Rajpurohit+, 2013)
The effective temperature scale of M dwarfs.
Rajpurohit A.S., Reyle C., Allard F., Homeier D., Schultheis M.,
Bessell M.S., Robin A.C.
<Astron. Astrophys., 556, A15 (2013)>
=2013A&A...556A..15R 2013A&A...556A..15R
ADC_Keywords: Stars, M-type ; Effective temperatures ; Photometry
Keywords: stars: atmospheres - stars: low-mass - stars: fundamental parameters
Abstract:
Despite their large number in the Galaxy, M dwarfs remain elusive
objects and the modeling of their photosphere has long remained a
challenge (molecular opacities, dust cloud formation). Our objectives
are to validate the BT-Settl model atmospheres, update the M dwarf
Teff-spectral type relation, and find the atmospheric parameters of
the stars in our sample.
We compare two samples of optical spectra covering the whole M dwarf
sequence with the most recent BT-Settl synthetic spectra and use a
χ2 minimization technique to determine Teff. The first sample
consists of 97 low-resolution spectra obtained with New Technology
Telescope (NTT) at La Silla Observatory. The second sample contains 55
medium-resolution spectra obtained at the Siding Spring Observatory
(SSO). The spectral typing is realized by comparison with already
classified M dwarfs.
Description:
We carried out spectroscopic observations on the 3.6mm New Technology
Telescope (NTT) at La Silla Observatory (ESO, Chile) in November 2003.
Optical low-resolution spectra were obtained in the red imaging and
low-dispersion spectroscopy (RILD) observing mode with the ESO Multi
Mode Instrument (EMMI) instrument.
The observations of 55 additional M dwarfs at Siding Spring
Observatory (SSO) were carried out using the Double Beam Spectrograph
(DBS).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 80 96 Observable and physical quantities for our
sample of stars observed at NTT with EMMI (ESO)
table2.dat 80 55 Observable and physical quantities for our
sample of stars observed at Siding Spring Obs.
--------------------------------------------------------------------------------
See also:
J/AN/321/277 : Effective temperatures of K-M giants (Strassmeier+, 2000)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Name
25 A1 --- n_Name [a] a: Saturation in near-IR bands
27- 30 A4 --- SpType Spectral type
32- 35 I4 K Teff Effective temperature
37- 40 I4 K Teff2 ?=- Effective temperature from Casagrande et
al. (2008, Cat. J/MNRAS/389/585)
42- 44 F3.1 [cm/s2] logg Surface gravity
46- 50 F5.2 mag Vmag ?=- V magnitude
52- 56 F5.2 mag Rmag ?=- R magnitude
58- 62 F5.2 mag Imag ?=- I magnitude
64- 68 F5.2 mag Jmag ?=- J magnitude
70- 75 F6.3 mag Hmag ?=- H magnitude
76- 80 F5.2 mag Kmag ?=- K magnitude
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Nov-2013