2006A&A...451..157E


Query : 2006A&A...451..157E

2006A&A...451..157E - Astronomy and Astrophysics, volume 451, 157-175 (2006/5-3)

The nature of ultraviolet spectra of AG Pegasi and other symbiotic stars: locations, origins, and excitation mechanisms of emission lines.

ERIKSSON M., JOHANSSON S. and WAHLGREN G.M.

Abstract (from CDS):

A detailed study of ultraviolet spectra of the symbiotic star AG Peg has been undertaken to derive the atomic excitation mechanisms and origin of formation for the lines common in symbiotic systems. More than 600 emission lines are observed in spectra from IUE, HST and FUSE of which 585 are identified. Population mechanisms and origin of formation are given for a majority of those lines. Based on the understanding of the AG Peg spectra IUE data of 19 additional symbiotic stars are investigated and differences and similarities of their spectra are discussed. Fe II fluorescence lines pumped by strong emission lines between 1000 and 2000Å are observed in 13 of these systems. Some of the symbiotic systems belonging to the subclass symbiotic novae have more than 100 Fe II fluorescence lines in the ultraviolet wavelength region. Forbidden lines are detected for 13 of the stars, mostly from highly-ionized spectra such as Ar V, Ne V and Mg V. Further, [Mg VI] and [Mg VII] lines are observed in a symbiotic star (AG Dra) for the first time. Five of the symbiotic stars have broad white-dwarf wind profiles (FWHM>400km/s) for a few lines in their spectra. The stars with no such broad lines can be divided into two similarly sized groups, one where all lines have FWHM less than 70km/s and the other where one, a few or all of the broad (FWHM>400km/s) lines of AG Peg have an enhanced broad wing (110-140km/s).

Abstract Copyright:

Journal keyword(s): atomic processes - line: formation - stars: binaries: symbiotic - ultraviolet: stars

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* EG And Sy* 00 44 37.1873792808 +40 40 45.704829252 10.54 8.93 7.22     M2.4III 276 0
2 V* AX Per Sy* 01 36 22.7004366768 +54 15 02.411547480   11.45 10.67 11.04   M3IIIep+A0 285 1
3 V* RX Pup Sy* 08 14 12.3039748200 -41 42 29.080069056   12.39 9.00     M5.5 194 1
4 V* SY Mus Sy* 11 32 09.9955543536 -65 25 11.458124364   11.97 10.20     M4 160 0
5 V* RW Hya Sy* 13 34 18.1289607744 -25 22 48.881433972   11.51 10.00     M1/2IIIe 192 0
6 V* T CrB Sy* 15 59 30.1622265912 +25 55 12.613382940   11.516 10.247 9.70   M3IIIe_sh 681 0
7 V* AG Dra Sy* 16 01 41.0120557968 +66 48 10.135056672 11.50 11.06 9.74 8.52   K3IIIep 490 0
8 V* KX TrA Sy* 16 44 35.4680860800 -62 37 14.058789276   11.91 11.38 12.33   M6 97 1
9 V* BF Cyg Sy* 19 23 53.5006095432 +29 40 29.177024952   10.52 9.30     Bep+M5III 269 0
10 V* CH Cyg Sy* 19 24 33.0657463320 +50 14 29.095038672 8.14 8.77 7.08   5.345 M7IIIab+Be 755 0
11 V* HM Sge Sy* 19 41 57.0795884928 +16 44 39.805863828   12.37 10.99 12.217   M7 442 0
12 V* CI Cyg Sy* 19 50 11.8342618008 +35 41 03.004794996   11.97 9.90     M4.9III 414 0
13 EM* AS 373 Sy* 19 57 05.0166505224 +39 49 36.076143036     11.50   10.592 M6/8e 576 0
14 V* RR Tel Sy* 20 04 18.5404499712 -55 43 33.153979080 9.93 11.33 10.81 11.689   M5e 528 0
15 V* PU Vul Sy* 20 21 13.3111130136 +21 34 18.697391652   11.13 10.87 11.697   M3+F2Ib 299 0
16 V* V1329 Cyg Sy* 20 51 01.2321742512 +35 34 54.111458316       13.36   M4IIIe 298 2
17 V* AG Peg Sy* 21 51 01.9739297352 +12 37 32.127939336   9.85 8.69     M3IIIe 500 0
18 V* Z And Sy* 23 33 39.9553225728 +48 49 05.974867308 8.86 9.35 8.00     M2III+B1eq 513 0
19 V* R Aqr Sy* 23 43 49.4634303216 -15 17 04.176349872   8.823 7.683 9.37   M6.5-8.5e 769 0

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2022.12.08-16:14:25

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