J/ApJ/879/105 Effective temperatures of low-mass stars (Lopez-Valdivia+, 2019)
Effective temperatures of low-mass stars from high-resolution H-band
spectroscopy.
Lopez-Valdivia R., Mace G.N., Sokal K.R., Hussaini M., Kidder B.T.,
Mann A.W., Gosnell N.M., Oh H., Kesseli A.Y., Muirhead P.S.,
Johns-Krull C.M., Jaffe D.T.
<Astrophys. J., 879, 105 (2019)>
=2019ApJ...879..105L 2019ApJ...879..105L
ADC_Keywords: Effective temperatures; Spectra, infrared; Stars, K-type;
Stars, M-type; Rotational velocities
Keywords: stars: fundamental parameters ; stars: low-mass
Abstract:
High-resolution, near-infrared spectra will be the primary tool for
finding and characterizing Earth-like planets around low-mass stars.
Yet, the properties of exoplanets cannot be precisely determined
without accurate and precise measurements of the host star. Spectra
obtained with the Immersion Grating Infrared Spectrometer
simultaneously provide diagnostics for most stellar parameters, but
the first step in any analysis is the determination of the effective
temperature. Here we report the calibration of high-resolution H-band
spectra to accurately determine the effective temperature for stars
between 4000 and 3000K (∼K8-M5) using absorption line-depths of FeI,
OH, and Al I. The field star sample used here contains 254 K and
M stars with temperatures derived using BT-Settl synthetic spectra. We
use 106 stars with precise temperatures in the literature to calibrate
our method, with typical errors of about 140K, and systematic
uncertainties less than ∼120K. For the broadest applicability, we
present Teff-line-depth-ratio relationships, which we test on 12
members of the TW Hydrae Association and at spectral resolving powers
between ∼10000 and 120000. These ratios offer a simple but accurate
measure of effective temperatures in cool stars that are distance and
reddening independent.
Description:
This analysis makes use of the spectra of K and M stars observed with
the Immersion Grating Infrared Spectrometer (IGRINS) since
commissioning in 2014 on the 2.7m Harlan J. Smith Telescope at the
McDonald Observatory, the 4.3m Discovery Channel Telescope at Lowell
Observatory, and the 8.1m Gemini South Telescope. IGRINS has no moving
parts and the spectral format is fixed with R∼45000 over the entire H
and K bands (14500 to 24500Å).
We began with all ∼4900 IGRINS observations between 2014 July and 2018
July.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 113 254 Basic information as well as our results
for our sample
refs.dat 67 50 References
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See also:
VI/39 : Model Atmospheres (Kurucz, 1979)
III/119 : Spectral classifications of proper motion stars (Bidelman+ 1985)
III/123 : Dwarf K and M stars of small proper motion (Stephenson 1986)
III/150 : Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989)
III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
III/266 : Revised First Byurakan Survey of late-type stars (Gigoyan+ 2012)
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/390/491 : DENIS new nearby stars (Reyle+, 2002)
J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)
J/AJ/128/463 : A preliminary 20pc census from NLTT (Reid+, 2004)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
J/A+A/442/211 : Spectroscopic distances of 322 NLTT stars (Scholz+, 2005)
J/MNRAS/373/13 : Lower MS stars fundamental param. (Casagrande+, 2006)
J/A+A/450/735 : Effective temperatures and radii of stars (Masana+, 2006)
J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006)
J/A+A/460/695 : Search for Assoc. Containing Young stars (Torres+, 2006)
J/MNRAS/374/664 : Atmospheric parameters in MILES library (Cenarro+, 2007)
J/AJ/133/2825 : Star beyond the NLTT catalog (Reid+, 2007)
J/AJ/133/2258 : Activity and kinematics of ultracool dwarfs (Schmidt+, 2007)
J/AJ/133/2524 : Spectra of young nearby stars (White+, 2007)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
J/A+A/487/373 : Spectroscopic param. of 451 HARPS-GTO stars (Sousa+, 2008)
J/A+A/504/981 : Proper motions of cool stars in Upper Sco OB (Bouy+, 2009)
J/ApJ/699/649 : Young M dwarfs within 25pc. I. (Shkolnik+, 2009)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/MNRAS/403/1949 : UBV(RcIc)JHK photometry of HIP nearby stars (Koen+, 2010)
J/A+A/531/A165 : MILES atmospheric parameters (Prugniel+, 2011)
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J/A+A/546/A27 : Radial velocity and photometry for GJ3470 (Bonfils+, 2012)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/A+A/546/A14 : Limb-darkening for CoRoT, Kepler, Spitzer (Claret+, 2012)
J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)
J/AJ/143/80 : Low-mass members of βPic & AB DOR (Schlieder+, 2012)
J/AJ/145/102 : Spec. of bright M dwarfs in the northern sky (Lepine+, 2013)
J/AJ/145/52 : Abund. of late K & M dwarfs in binary systems (Mann+, 2013)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/A+A/556/A15 : Effective temperature scale of M dwarfs (Rajpurohit+, 2013)
J/A+A/556/A150 : SWEETCat I. Stellar param. for host stars (Santos+, 2013)
J/A+A/555/A150 : Physical param. of cool solar-type stars (Tsantaki+, 2013)
J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)
J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)
J/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)
J/A+A/577/A128 : CARMENES input cat. of M dwarfs. I (Alonso-Floriano+, 2015)
J/ApJS/216/7 : Planets Around Low-Mass Stars (PALMS). IV. (Bowler+, 2015)
J/AJ/149/131 : Param. of galactic nearby main-sequence stars (Eker+, 2015)
J/ApJ/810/158 : M,L,T dwarfs fundamental param. and SEDs (Filippazzo+, 2015)
J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)
J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
J/ApJ/800/85 : Teff, radii and luminosities of cool dwarfs (Newton+, 2015)
J/ApJ/802/L10 : M dwarf SpeX NIR spectroscopy (Terrien+, 2015)
J/ApJ/812/3 : MEarth mid-to-late M dwarfs rot. & kinematics (West+, 2015)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Star name
25- 29 A5 --- SpT Spectral type
31- 32 I2 --- r_SpT [1/50] Simbad reference for SpT
(see refs.dat file)
34- 38 F5.2 mag Jmag [3.8/12.5]? 2MASS J band magnitude
40- 44 F5.2 mag rmag [6.6/16.3]? APASS r band magnitude
46- 49 I4 K T(r-J) [2801/4594]? The (r-J) color temperature
51 A1 --- l_vsini Limit flag on vsini
52- 53 I2 km/s vsini [7/53]? Rotational velocity
55- 59 F5.3 --- LD(Fe) [0.014/0.41]? Line-depth of Fe
61- 65 F5.3 --- e_LD(Fe) [0.001/0.2]? Error in LD(Fe)
67- 71 F5.3 --- LD(OH) [0/0.3]? Line-depth of OH
73- 77 F5.3 --- e_LD(OH) [0.001/0.2]? Error in LD(OH)
79- 84 F6.3 --- LD(peak) [-0.11/-0.013]? Line-depth of peak
86- 90 F5.3 --- e_LD(peak) [0.001/0.02]? Error in LD(peak)
92- 96 F5.3 --- LD(Al) [0.051/0.46]? Line-depth of Al
98-102 F5.3 --- e_LD(Al) [0.001/0.02]? Error in LD(Al)
104 I1 --- f_Tspec [1/4] Region from temperature was computed (1)
106-109 I4 K Tspec [2850/4440] Final temperature
111-113 I3 K e_Tspec [90/140] Error in Tspec (2)
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Note (1): Region code as follows:
1 = OH region (15600-15650Å); see Section 3.2.
2 = Al region (16700-16780Å); see Section 3.3.
3 = Both regions.
4 = It is a limit.
Note (2): The error reported is just the random uncertainties, while the
systematic one were estimate in Section 4.1.4 and are of 120K.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode of the reference
24- 45 A22 --- Auth Author's name(s)
47- 67 A21 --- Comm Comment
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Dec-2020