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J/MNRAS/395/593 ASAS chromospherically active eclipsing binaries (Parihar+ 2009)

Spectroscopic survey of ASAS eclipsing variables: search for chromospherically active eclipsing binary stars. I. Parihar P., Messina S., Bama P., Medhi B.J., Muneer S., Velu C., Ahmad A. <Mon. Not. R. Astron. Soc., 395, 593-607 (2009)> =2009MNRAS.395..593P
ADC_Keywords: Binaries, eclipsing ; Photometry, infrared ; MK spectral classification Keywords: stars: activity - binaries: close - stars: emission-line, Be - stars: individual: HD 89620 - stars: late-type Abstract: We have started a spectroscopic survey to identify new chromospherically active components and low-mass pre-main sequence (PMS) stars in recently discovered All Sky Automated Survey (ASAS) eclipsing binaries. In this paper, we briefly describe our scientific motivation, the observing tools and the results obtained from the first phase of this survey. Using the available observing facilities in India, the spectroscopic observations of a sample of 180 candidate eclipsing binary stars selected from ASAS-I&II releases were carried out during 2004-2006. The strength of Halpha emission was used to characterize the level of chromospheric activity. Our spectroscopic survey reveals that out of 180 stars about 36 binary systems show excess Halpha emission. One of the objects in our sample, ASAS 081700-4243.8, displays very strong Halpha emission. Follow-up high-resolution spectroscopic observations reveal that this object is indeed very interesting and most likely a classical Be-type system with K0III companion. Description: The medium-resolution spectroscopic survey of our 180 ASAS stars was carried out using the 2-m Himalayan Chandra Telescope (HCT) of Indian Astronomical Observatory (IAO) equipped with the Himalaya Faint Object Spectrograph (HFOSC) spectrograph and the 2.3-m Vainu Bappu Telescope (VBT) of Vainu Bappu Observatory (VBO) equipped with the Optomechanics Research (OMR) spectrograph. High-resolution optical spectra of one particularly interesting target HD 69820 (ASAS 081700-4243.8) were obtained with two different instruments: the fibre-fed coude echelle spectrometer of the 2.3-m VBT and University College London Echelle Spectrograph (UCLES) at the 4-m Anglo-Australian Telescope (AAT) of Anglo-Australian Observatory (AAO). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 153 180 Log of medium resolution spectra collected from HCT and VBT telescopes
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-05) J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998) J/AcA/50/177 : All Sky Automated Survey Catalog (Pojmanski+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequential number 5- 17 A13 --- ASAS Star name (HHMMSS+DDMM.m) (4) 19- 21 A3 --- Tel Telescope (1) 23- 32 A10 "YYYY-MM-DD" ObsDate Date of observation 34- 37 I4 s ExpTime Exposure time 39- 42 F4.2 --- AirM Air mass 44- 51 F8.4 d Per Orbital period 53- 59 F7.2 d Epoch Epoch of observation (MHD=HJD-2450000) 61- 65 F5.2 mag Vmax Brightest V magnitude 67- 70 F4.2 mag Vamp Amplitude in V band 72- 75 F4.2 mag V-J V-J colour index 77- 80 F4.2 mag V-H V-H colour index 82- 85 F4.2 mag V-K V-K colour index 87- 90 F4.2 mag J-H J-H colour index 92- 95 F4.2 mag H-K H-K colour index 97-101 F5.3 --- phi ?=- Orbital phase at which the 2MASS photometry was made 103-105 A3 --- n_phi Note on the epoch of 2MASS photometry (2) 107-112 A6 --- Etype Eclipsing type (3) 114 A1 --- X [X] if X-ray emission 116-153 A38 --- SpType MK spectral types
Note (1): Telescope is hct or vbt: hct = 2-m Himalayan Chandra Telescope of Indian Astronomical Observatory, equipped with the Himalaya Faint Object Spectrograph (HFOSC) spectrograph vbt = 2.3-m Vainu Bappu Telescope of Vainu Bappu Observatory, equipped with the Optomechanics Research (OMR) spectrograph Note (2): Note as follows: ooe = out of eclipse inI = at primary minimum iII = at secondary minimum, imi = primary and secondary minimum of similar depth x = indicate that 2MASS observations were made close to the beginning/end phases of minimum Note (3): eclipsing variables classified as Contact (EC), semi-detached (ESD) or detached (ED); or miscellaneous (MISC). Note (4): this name was truncated to HHMMSS+DDMM in the published table; the fraction of acrmin in the declination was added at CDS from a comparison with the ASAS catalog (II/264)
History: * 14-Sep-2009: From electronic version of the journal * 24-Nov-2009: ASAS name corrected (was truncated in the published table, see the "Note (4)" section above.
(End) Patricia Vannier [CDS] 14-Sep-2009
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