Spatially resolved spectra of the accretion disc of the nova-like variable UU Aquarii

被引:16
作者
Baptista, R
Silveira, C
Steiner, JE
Horne, K
机构
[1] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
[2] CNPq, Lab Nacl Astrofis, BR-37500000 Itajuba, Brazil
[3] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
关键词
accretion; accretion discs; binaries : close; binaries : eclipsing; stars : individual : UU Aqr; novae; cataclysmic variables;
D O I
10.1046/j.1365-8711.2000.03325.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Time-resolved spectroscopy of the nova-like variable UU Aquarii is analysed with eclipse mapping techniques to produce spatially resolved spectra of its accretion disc and gas stream as a function of distance from disc centre in the range 3600-6900 Angstrom. The spatially resolved spectra show that the continuum emission becomes progressively fainter and redder for increasing disc radius - reflecting the radial temperature gradient - and reveal that the H I and He I Lines appear as deep, narrow absorption features in the inner disc regions, transitioning to emission with P Cyg profiles for intermediate and large disc radii. The spectrum of the uneclipsed component has strong H I and He I emission lines plus a Balmer jump in emission, and is explained as optically thin emission from a vertically extended disc chromosphere + wind. Most of the line emission probably arises from the wind. The spatially resolved spectra also suggest the existence of gas stream 'disc-skimming' overflow in UU Aqr, which can be seen down to R similar or equal to 0.2R(L1) The comparison of our eclipse maps with those of Baptista, Steiner & Horne suggests that the asymmetric structure in the outer disc previously identified as the bright-spot may be the signature of an elliptical disc similar to those possibly present in SU UMa stars during superoutbursts.
引用
收藏
页码:713 / 726
页数:14
相关论文
共 35 条
[1]   Accretion disks in interacting binaries: Simulations of the stream-disk impact [J].
Armitage, PJ ;
Livio, M .
ASTROPHYSICAL JOURNAL, 1996, 470 (02) :1024-1032
[2]   Hydrodynamics of the stream-disk impact in interacting binaries [J].
Armitage, PJ ;
Livio, M .
ASTROPHYSICAL JOURNAL, 1998, 493 (02) :898-+
[3]  
BAPTISTA R, 1993, ASTRON ASTROPHYS, V277, P331
[4]   Multicolour eclipse studies of UU Aquarii .2. The accretion disc [J].
Baptista, R ;
Steiner, JE ;
Horne, K .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 282 (01) :99-116
[5]   HUBBLE-SPACE-TELESCOPE AND R-BAND ECLIPSE MAPS OF THE UX URSAE-MAJORIS ACCRETION DISK [J].
BAPTISTA, R ;
HORNE, K ;
HILDITCH, RW ;
MASON, KO ;
DREW, JE .
ASTROPHYSICAL JOURNAL, 1995, 448 (01) :395-415
[6]   MULTICOLOR ECLIPSE STUDIES OF UU-AQUARII .1. OBSERVATIONS AND SYSTEM PARAMETERS [J].
BAPTISTA, R ;
STEINER, JE ;
CIESLINSKI, D .
ASTROPHYSICAL JOURNAL, 1994, 433 (01) :332-349
[7]   HST spatially resolved spectra of the accretion disc and gas stream of the nova-like variable UX Ursae Majoris [J].
Baptista, R ;
Horne, K ;
Wade, RA ;
Hubeny, I ;
Long, KS ;
Rutten, RGM .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 298 (04) :1079-1091
[8]  
BAPTISTA R, 1993, ASP C SER, V56, P259
[9]   SPECTROSCOPY OF THE CATACLYSMIC VARIABLE UU-AQR [J].
DIAZ, MP ;
STEINER, JE .
ASTRONOMICAL JOURNAL, 1991, 102 (04) :1417-1422
[10]   SPECTROSCOPIC OBSERVATIONS OF H-ALPHA EMISSION STARS FROM THE STEPHENSON AND STEPHENSON-SANDULEAK LISTS [J].
DOWNES, RA ;
KEYES, CD .
ASTRONOMICAL JOURNAL, 1988, 96 (02) :777-790