J/AJ/161/172 The Solar Neighborhood. XLVII. Mdwarfs with STIS (Dieterich+, 2021)
The Solar Neighborhood.
XLVII. Comparing M-dwarf models with Hubble Space Telescope dynamical masses and
spectroscopy.
Dieterich S.B., Simler A., Henry T.J., Jao W.-C.
<Astron. J., 161, 172 (2021)>
=2021AJ....161..172D 2021AJ....161..172D
ADC_Keywords: Stars, dwarfs; Stars, M-type; Spectra, optical; Spectra, infrared
Keywords: M dwarf stars ; Astrometric binary stars ; Stellar interiors ;
Stellar evolutionary models ; Stellar atmospheres ; Stellar masses
Abstract:
We use HST/STIS optical spectroscopy of 10 M-dwarfs in five closely
separated binary systems to test models of M-dwarf structure and
evolution. Individual dynamical masses ranging from 0.083 to
0.405M☉ for all stars are known from previous work. We first
derive temperature, radius, luminosity, surface gravity, and
metallicity by fitting the BT-Settl atmospheric models. We verify that
our methodology agrees with empirical results from long-baseline
optical interferometry for stars of similar spectral types. We then
test whether or not evolutionary models can predict those quantities
given the stars' known dynamical masses and the conditions of
coevality and equal metallicity within each binary system. We apply
this test to five different evolutionary model sets: the Dartmouth
models, the MESA/MIST models, the models of Baraffe et al., the PARSEC
models, and the YaPSI models. We find marginal agreement between
evolutionary model predictions and observations, with few cases where
the models respect the condition of coevality in a self-consistent
manner. We discuss the pros and cons of each family of models and
compare their predictive power.
Description:
We obtained spatially resolved intermediate-resolution (R∼10000) red
optical spectroscopy for the components of five binary systems using
the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space
Telescope (HST) through program 12938.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 10 *Astrometric Properties
fig1.dat 36 32782 STIS spectra for 5 stars
fig2.dat 36 32692 STIS spectra for 5 other stars
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Note on table1.dat: Values from Benedict+, 2016, J/AJ/152/141 except date of
HST/STIS observation and separation from that observation.
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/106/773 : Mass-luminosity relation (Henry+, 1993)
J/A+A/327/1039 : Structure and evolution of low-mass stars (Chabrier+, 1997)
J/AJ/129/413 : New high proper motion stars (-90<DE47) (Subasavage+, 2005)
J/AJ/130/1658 : High proper motion stars (-47<δ<00) (Subasavage+, 2005)
J/AJ/133/2898 : New proper-motion stars (-90<DE< -47) (Finch+, 2007)
J/AJ/134/252 : New nearby white dwarf systems (Subasavage+, 2007)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/AJ/141/21 : CCD distance estimates of SCR targets (Winters+, 2011)
J/AJ/142/10 : New proper motion stars 0.40"/yr>pm≥0.18"/yr (Boyd+, 2011)
J/AJ/142/92 : New proper motion stars with pm≥0.18"/yr (Boyd+, 2011)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/AJ/143/93 : Rotational velocities in early-M stars (Reiners+, 2012)
J/AJ/144/64 : Solar neighborhood. XXVIII. Substellar comp. (Dieterich+,2012)
J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)
J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)
J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014)
J/AJ/149/5 : Solar neighborhood. XXXV. Dist to M dwarfs (Winters+, 2015)
J/AJ/150/6 : Solar neighborhood. XXXVI. VRI variab. M dwarfs (Hosey+, 2015)
J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
J/AJ/152/141 : Solar neighborhood. XXXVII. RVs for M dwarfs (Benedict+, 2016)
J/AJ/153/14 : Solar neighborhood XXXVIII. Nearby M dwarf (Winters+, 2017)
J/AJ/154/32 : Solar neighborhood. XXXIX. White dwarfs (Subasavage+, 2017)
J/AJ/154/151 : The solar neighborhood .XXXX. New young stars (Bartlett+,2017)
J/AJ/154/124 : M dwarfs-long-term photometric variability (Clements+, 2017)
J/AJ/154/191 : The solar neighborhood. XLII. New nearby subdwarfs (Jao+,2017)
J/A+A/620/A180 : Stellar properties of M dwarfs (Rajpurohit+, 2018)
J/AJ/156/49 : The solar neighborhood. XLIII. New nearby stars (Riedel+,2018)
J/AJ/155/265 : The solar neighborhood. XLIV. RECONS discoveries (Henry+,2018)
J/AJ/157/216 : Stellar multipl. rate of Mdwarfs within 25pc (Winters+, 2019)
J/AJ/160/215 : The solar neighborhood.XLVI. M dwarf binaries (Vrijmoet+,2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Designation of the star
11 A1 --- f_Star [a] a = Parallax from Gaia DR2 (2 occurrences)
13- 14 I2 h RAh [0/19] System Hour of right ascension (J2000)
16- 17 I2 min RAm System minute of right ascension (J2000)
19- 22 F4.1 s RAs System second of right ascension (J2000)
24 A1 --- DE- [+] System Sign of declination (J2000)
26- 27 I2 deg DEd [8/67] System degree of declination (J2000)
29- 30 I2 arcmin DEm System arcminute of declination (J2000)
32- 35 F4.1 arcsec DEs System arcsecond of declination (J2000)
37- 41 F5.1 mas Plx [65.2/213.1] Parallax
43- 45 F3.1 mas e_Plx [0.3/0.6] Error on Plx
47- 51 F5.1 mas a [271.2/826.7] Semi-major axis (1)
53- 55 F3.1 mas e_a [0.7/2.7] Error on a
57- 62 F6.1 d Per [4066.1/6147] Period
64- 67 F4.1 d e_Per [2.2/27.5] Error on Per
69- 73 F5.3 Msun Mass [0.08/0.405] Star mass
75- 79 F5.3 Msun e_Mass [0.001/0.081] Error on Mass
81- 84 I4 yr Obs.Y [2012/2013] Year of observation
86- 87 I2 "month" Obs.M Month of observation
89- 90 I2 d Obs.D Day of observation
92- 94 I3 mas Sep [152/598] Approximative separation
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Note (1): Semimajor axis of relative orbit of secondary around primary component
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Byte-by-byte Description of file: fig[12].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Star Star Identifier
13- 22 F10.4 0.1nm Wave Wavelength; Angstroms
24- 36 E13.6 cW/m2/nm Flux Flux; erg/s/cm2/Angstrom
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History:
From electronic version of the journal
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(End) Prepared by [AAS], Coralie Fix [CDS], 22-Jun-2021