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J/AJ/153/35     Infrared spectroscopy of symbiotic stars. XI.     (Fekel+, 2017)

Infrared spectroscopy of symbiotic stars. XI. Orbits for southern S-type systems: Hen 3-461, SY Mus, Hen 3-828, and AR Pav. Fekel F.C., Hinkle K.H., Joyce R.R., Wood P.R. <Astron. J., 153, 35-35 (2017)> =2017AJ....153...35F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, M-type ; Stars, giant ; Spectroscopy ; Radial velocities Keywords: binaries: symbiotic - infrared: stars - stars: late-type Abstract: Employing new infrared radial velocities, we have computed spectroscopic orbits of the cool giants in four southern S-type symbiotic systems. The orbits for two of the systems, Hen 3-461 and Hen 3-828, have been determined for the first time, while orbits of the other two, SY Mus and AR Pav, have previously been determined. For the latter two systems, we compare our results with those in the literature. The low mass of the secondary of SY Mus suggests that it has gone through a common envelope phase. Hen 3-461 has an orbital period of 2271 days, one of the longest currently known for S-type symbiotic systems. That period is very different from the orbital period proposed previously from its photometric variations. The other three binaries have periods between 600 and 700 day, values that are typical for S-type symbiotic orbits. Basic properties of the M giant components and the distance to each system are determined. Description: Our spectroscopic observations in the southern hemisphere were initially acquired from 2001 March through 2002 December. We observed at the Mount Stromlo Observatory (MSO), which is located near Canberra, Australia, and used the 1.88m telescope and coude spectrograph. The detector to record our spectra was an infrared camera, NICMASS, that was developed at the University of Massachusetts. It produced a 2 pixel resolving power of 44000 at a wavelength of 1.623µm. Between 2003 February and 2010 June we obtained some additional spectra with the 8m Gemini South telescope, located at Cerro Pachon, Chile. We used the Phoenix cryogenic echelle spectrograph. That spectrograph enabled us to observe at several different infrared wavelength regions including 1.563, 2.226, and 2.364µm, and the Gemini South spectra have a resolving power equal to either 50000 or 70000. From 2009 May through 2010 June we also used the 1.5m telescope at the Cerro Tololo Inter-American Observatory (CTIO). That telescope is operated by the Small and Moderate Aperature Research Telescope System (SMARTS) consortium of universities and other organizations. During that time period, we acquired five spectra with the 1.5m telescope, a fiber fed echelle spectrograph, and a 2K SITe CCD. The spectra have a resolving power of ∼25000 at 5500Å. The echelle spectrograms from the 1.5m SMARTS telescope cover the wavelength range 4020-7300Å. We chose to measure velocities in one of the reddest orders of the SMARTS echelle spectrograms at a wavelength region near 7130Å. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 41 4 Basic properties of the program stars table2.dat 37 30 Radial velocities of Hen 3-461 table5.dat 37 58 Radial velocities of SY Mus table8.dat 37 18 Radial velocities of Hen 3-828 table11.dat 37 51 Radial velocities of AR Pav
See also: B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014) III/150 : Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989) J/A+AS/146/407 : Symbiotic stars catalogue (Belczynski+, 2000) J/A+AS/93/383 : UBVRIJHKL photometry of symbiotic stars (Munari+ 1992) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 15 F5.2 mag Vmag The V-band magnitude (1) 17- 20 F4.2 mag Kmag The K-band magnitude (1) 22 A1 --- f_Kmag [c] Flag when Kmag is from Glass & Webster 1973MNRAS.165...77G 24- 27 F4.2 mag H-K The (H-K) color index (1) 29 A1 --- f_H-K [c] Flag when H-K is from Glass & Webster 1973MNRAS.165...77G 31- 34 A4 --- SpT Cool star spectral type (2) 36- 41 F6.1 d Per Orbital period
Note (1): Munari et al. 1992 (Cat. J/A+AS/93/383) unless otherwise indicated. Note (2): Spectral class is from Murset & Schmid 1999A&AS..137..473M.
Byte-by-byte Description of file: table[258].dat,table11.dat
Bytes Format Units Label Explanations
1- 9 F9.3 d HJD Heliocentric Julian Date (HJD-2400000) 11- 15 F5.3 --- Phase [0/1] Phase 17- 21 F5.1 km/s RV [-78.5/47] Radial velocity 23- 26 F4.1 km/s O-C [-6.6/4] The (O-C) residual 28- 30 F3.1 --- Weight [0.1/1]? Weight (only for SY Mus and AR Pav) 32- 37 A6 --- Obs Observatory (CASLEO, CTIO, Gem S, LSO, or MSO) (G1)
Global Notes: Note (G1): The observatory codes are defined as follows: CASLEO = Complejo AStronomico el LEOncito; Gem S = Gemini South Observatory (located at Cerro Pachon, Chile); CTIO = Cerro Tololo Inter-American Observatory; LSO = La Silla Observatory; MSO = Mount Stromlo Observatory (located near Canberra, Australia).
History: From electronic version of the journal References: Fekel et al., Paper I 2000AJ....119.1375F Fekel et al., Paper II 2000AJ....120.3255F Fekel et al., Paper III 2001AJ....121.2219F Hinkle et al., Paper IV 2006ApJ...641..479H Fekel et al., Paper V 2007AJ....133...17F Fekel et al., Paper VI 2008AJ....136..146F Hinkle et al., Paper VII 2009ApJ...692.1360H Fekel et al., Paper VIII 2010AJ....139.1315F Hinkle et al., Paper IX 2013ApJ...770...28H Fekel et al., Paper X 2015AJ....150...48F
(End) Sylvain Guehenneux [CDS] 22-Jun-2017
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