Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/786/120  Spectropolarimetric survey of classical Be stars  (Draper+, 2014)

Disk-loss and disk-renewal phases in classical Be stars. II. Contrasting with stable and variable disks. Draper Z.H., Wisniewski J.P., Bjorkman K.S., Meade M.R., Haubois X., Mota B.C., Carciofi A.C., Bjorkman J.E. <Astrophys. J., 786, 120 (2014)> =2014ApJ...786..120D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Be ; Spectral types ; Effective temperatures ; Polarization ; Equivalent widths Keywords: circumstellar matter - stars: individual: pi Aqr, 60 Cyg, 48 Lib, psi Per, phi Per, 28 Cyg, 66 Oph, gamma Casseopia, omega Ori, FY CMa, 59 Cyg Abstract: Recent observational and theoretical studies of classical Be stars have established the utility of polarization color diagrams (PCDs) in helping to constrain the time-dependent mass decretion rates of these systems. We expand on our pilot observational study of this phenomenon, and report the detailed analysis of a long-term (1989-2004) spectropolarimetric survey of nine additional classical Be stars, including systems exhibiting evidence of partial disk-loss/disk-growth episodes as well as systems exhibiting long-term stable disks. After carefully characterizing and removing the interstellar polarization along the line of sight to each of these targets, we analyze their intrinsic polarization behavior. We find that many steady-state Be disks pause at the top of the PCD, as predicted by theory. We also observe sharp declines in the Balmer jump polarization for later spectral type, near edge-on steady-state disks, again as recently predicted by theory, likely caused when the base density of the disk is very high, and the outer region of the edge-on disk starts to self absorb a significant number of Balmer jump photons. The intrinsic V-band polarization and polarization position angle of γ Cas exhibits variations that seem to phase with the orbital period of a known one-armed density structure in this disk, similar to the theoretical predictions of Halonen & Jones. We also observe stochastic jumps in the intrinsic polarization across the Balmer jump of several known Be+sdO systems, and speculate that the thermal inflation of part of the outer region of these disks could be responsible for producing this observational phenomenon. Finally, we estimate the base densities of this sample of stars to be between ∼8x10-11 and ∼4x10-12 g/cm3 during quasi steady state periods given there maximum observed polarization. Description: The spectropolarimetric data analyzed in this study were obtained by the University of Wisconsin's HPOL spectropolarimeter, mounted on the 0.9 m Pine Bluff Observatory (PBO) telescope. Data obtained before 1995 were recorded using a dual Reticon array detector spanning the wavelength range of 3200-7600 Å with a spectral resolution of 25 Å (Wolff et al. 1996AJ....111..856W). Beginning in 1995, HPOL's detector was upgraded to a 400x1200 pixel CCD camera that provided coverage from 3200 to 6020 Å at a resolution of 10 Å and 5980-10500 Å at a resolution of 7 Å (Nordsieck & Harris 1996, Polarimetry of the Interstellar Medium (ASP Conf. Ser. 97), ed. W. G. Roberge & D. C. B. Whittet (San Francisco, CA: ASP), 1000). Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 15 58 11.37 -14 16 45.7 48 Lib = HD 142983 03 36 29.38 +48 11 33.5 psi Per = HD 22192 01 43 39.64 +50 41 19.4 phi Per = HD 10516 20 09 25.62 +36 50 22.6 28 Cyg = HD 191610 18 00 15.80 +04 22 07.0 66 Oph = HD 164284 00 56 42.53 +60 43 00.3 gamma Casseopia = HD 5394 05 39 11.15 +04 07 17.3 omega Ori = HD 37490 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 78 11 Target Star Summary table2.dat 50 151 Raw HPOL Data table5.dat 45 151 Intrinsic Polarization
See also: II/220 : Polarisation of Be stars (McDavid, 1986-1999) J/PASP/106/949 : Multicolor polarimetry of Be stars (McDavid, 1994) J/A+A/368/912 : Polarization and rotational velocities of Be stars (Yudin, 2001) J/A+A/440/305 : Fundamental parameters of fast-rotating B stars (Fremat+, 2005) J/A+A/459/137 : Bright Be shell stars (Rivnius+, 2006) J/ApJ/709/1306 : Spectropolarimetry of 60 Cyg and π Aqr (Wisniewski+, 2010) J/other/BASI/39.517 : Spectroscopy of classical Be stars (Mathew+, 2011) J/A+A/550/A79 : Hα and Hβ lines of northern Be stars (Catanzaro, 2013) J/ApJ/768/128 : K-band calibrated visibilities of 24 Be stars (Touhami+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Target identifier 18- 25 A8 --- SpType Spectral type (1) 27- 31 I5 deg Teff Effective temperature 33- 35 I3 deg e_Teff ? Uncertainty in Teff 37 I1 --- r_Teff [1/3] Teff reference (2) 39 A1 --- l_Inc1 [~] Limit flag on Inc1 40- 43 A4 deg Inc1 ? Disk inclination 45 I1 deg e_Inc1 ? Uncertainty in Inc1 47- 49 A3 --- r_Inc1 Inc1 reference(s) (3) 51- 52 I2 deg Inc2 ? Disk inclination 54 I1 --- r_Inc2 [6]? Inc2 reference (3) 56- 57 I2 --- HPOLRet [2/53] Number of HPOL Reticon Nights 59- 60 I2 --- HPOLCCD [3/57] Number of HPOL CCD Nights 62- 68 A7 --- WUPPE Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) observation ? (4) 70- 78 A9 --- SName Short name used in tables 2 and 5
Note (1): Spectral types were adopted from SIMBAD, except for 48 Lib which is identified as B3 in a more detailed study (Stefl et al. 2012A&A...540A..76S). Note (2): Reference as follows: 1 = Fremat et al. (2005, J/A+A/440/305); 2 = Cantanzaro (2013, J/A+A/550/A79); 3 = Koubsky et al. (2000A&A...356..913K). Note (3): Reference as follows: 4 = Delaa et al. (2011A&A...529A..87D); 5 = Touhami et al. (2013, J/ApJ/768/128); 6 = Fremat et al. (2005, J/A+A/440/305); 7 = Rivinius et al. (2006, J/A+A/459/137); 8 = Stefl et al. (2012A&A...540A..76S). Note (4): If the target was observed with the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE), the mission which took the data is listed.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- SName Target identifier 14- 22 F9.1 d JD Julian Date of observation 24- 29 F6.3 % Q Raw V band Q polarization 31- 37 F7.4 % U Raw V band U polarization 39- 43 F5.3 % Error Error in the polarization 45- 50 F6.2 0.1nm EW Hα equivalent width; Angstroms
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 9 A9 --- SName Target identifier 14- 22 F9.1 d JD Julian Date of observation 24- 30 F7.4 % Q Intrinsic V band Q polarization 32- 38 F7.4 % U Intrinsic V band U polarization 40- 45 F6.4 % Error Error in the polarization
History: From electronic version of the journal References: Wisniewski et al., Paper I, 2010ApJ...709.1306W, Cat. J/ApJ/709/1306
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 22-Jun-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact