J/ApJ/900/L43 NIR APOGEE radial velocities of Draco C1 (Lewis+, 2020)
Geometry of the Draco C1 symbiotic binary.
Lewis H.M., Anguiano B., Stassun K.G., Majewski S.R., Arras P.,
Sarazin C.L., Li Z.-Y., De Lee N., Troup N.W., Allende Prieto C.A.,
Badenes C., Cunha K., Garcia-Hernandez D.A., Nidever D.L., Palicio P.A.,
Simon J.D., Smith V.V.
<Astrophys. J., 900, L43 (2020)>
=2020ApJ...900L..43L 2020ApJ...900L..43L
ADC_Keywords: Stars, double and multiple; Radial velocities; Stars, carbon;
Stars, white dwarf; Spectra, infrared
Keywords: Draco dwarf galaxy ; Radial velocity ; Symbiotic binary stars ;
White dwarf stars ; Carbon stars ; Binary stars ; Spectroscopy
Abstract:
Draco C1 is a known symbiotic binary star system composed of a carbon
red giant and a hot, compact companion-likely a white dwarf-belonging
to the Draco dwarf spheroidal galaxy. From near-infrared spectroscopic
observations taken by the Apache Point Observatory Galactic Evolution
Experiment (APOGEE-2), part of Sloan Digital Sky Survey IV, we provide
updated stellar parameters for the cool, giant component, and
constrain the temperature and mass of the hot, compact companion.
Prior measurements of the periodicity of the system, based on only a
few epochs of radial velocity data or relatively short baseline
photometric observations, were sufficient only to place lower limits
on the orbital period (P>300d). For the first time, we report precise
orbital parameters for the binary system: with 43 radial velocity
measurements from APOGEE spanning an observational baseline of more
than 3yr, we definitively derive the period of the system to be
1220.0-3.5+3.7days. Based on the newly derived orbital period and
separation of the system, together with estimates of the radius of the
red giant star, we find that the hot companion must be accreting
matter from the dense wind of its evolved companion.
Description:
We utilize multi-epoch, high-resolution (R∼22500) near-infrared (NIR;
1.51-1.70um) spectra from the APOGEE spectrograph, taken via APOGEE-2
as part of the Sloan Digital Sky Survey (SDSS-IV; see III/284).
Draco C1 was included on multiple plate designs, each receiving six or
more visits to date. As a result, the red giant (RG) component of the
Draco C1 system (2MASS J17195764+5750054) has been observed 46 times
over the duration of the APOGEE-2 survey, with those visits spanning
>3yr (2016 April through 2019 June).
Objects:
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RA (ICRS) DE Designation(s) (Period)
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17 19 57.66 +57 50 05.5 Draco C1 = [ALS82] C1 (P=1220)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 34 43 RV measurements from APOGEE
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See also:
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009-)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
J/AJ/110/2131 : M/L for Draco and UMi. I. (Armandroff+ 1995)
J/A+AS/146/407 : Symbiotic stars catalogue (Belczynski+, 2000)
J/AJ/124/1651 : Faint high-latitude carbon stars SDSS phot. (Margon+, 2002)
J/A+A/383/188 : Spectrophotometric atlas of symbiotic stars (Munari+, 2002)
J/A+A/386/237 : UBV(RI)c photometry of 7 symbiotic stars (Munari+, 2002)
J/AJ/127/2838 : Faint high-latitude carbon stars SDSS phot. (Downes+, 2004)
J/MNRAS/375/831 : Draco MegaCam, INT and HST photometry (Segall+, 2007)
J/AJ/136/1921 : Variable stars of Draco dSph (Kinemuchi+, 2008)
J/BaltA/17/293 : Symbiotic stars multi-epoch UBV(RI)c phot. (Henden+, 2008)
J/MNRAS/411/2770 : Hot white dwarfs in GALEX-DR5 (Bianchi+, 2011)
J/ApJ/730/67 : Radial velocities of low-mass white dwarfs (Brown+, 2011)
J/MNRAS/413/1121 : SDSS post-common envelope bin. X (Rebassa-Mansergas+ 2011)
J/AN/333/242 : Recent photometry of symbiotic stars (Skopal+, 2012)
J/ApJ/765/12 : Carbon stars & DQ WDs from SDSS-DR7+DR8 (Green, 2013)
J/MNRAS/448/2717 : Bayesian analysis of resolved stellar sp. (Walker+, 2015)
J/MNRAS/451/2735 : Four close dSph XXM observations (Manni+, 2015)
J/ApJ/801/125 : Carbon in red giants in GCs and dSph galaxies (Kirby+, 2015)
J/ApJ/821/54 : XMM spectral analysis of Draco dSph (Sonbas+, 2016)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/AJ/152/180 : Bolometric fluxes of EBs in Tycho-2 (Stassun+, 2016)
J/AJ/153/136 : Planets & host stars with Gaia parallaxes (Stassun+, 2017)
J/AJ/156/257 : Spectroscopy of RGB stars in Draco (Spencer+, 2018)
J/ApJS/240/21 : Symbiotic stars with 2MASS, WISE & Gaia data (Akras+, 2019)
J/ApJ/872/43 : IR sp. of symbiotic stars. XII. V934 Her (Hinkle+, 2019)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 -- MJD [57495.5/58658.33] Modified Julian date
of observation (JD-2400000.5)
13- 22 F10.5 km/s RVel [-304.15/-294.17] Derived barycentric
radial velocity
24- 34 F11.9 km/s e_RVel [0.08/0.31] Uncertainty in RVel
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Jan-2022