2013A&A...550A..79C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:05:46

2013A&A...550A..79C - Astronomy and Astrophysics, volume 550A, 79-79 (2013/2-1)

Spectroscopic atlas of Hα and Hβ in a sample of northern Be stars.

CATANZARO G.

Abstract (from CDS):

Be stars are fast-rotating early-type emission line stars. It is generally assumed that observed emission is generated in a rotating disk-like envelope, as supported by the observed correlation between the stellar projected rotational velocity v sin i and the width of the emission lines. Then, high-resolution spectroscopic observations of Balmer lines profiles play an important role in putting constraints on Be stars modeling. We present Balmer lines spectroscopy for a sample of 48 Be stars. For most of them, Hα and Hβ have been observed more than two times, in a total period spanning almost two years between 2008 and 2009. Spectral synthesis of the Hα profile was performed following two steps: photospheric contribution was computed by using Kurucz's code ATLAS9 and SYNTHE, and disk emission was derived by the approach of Hummel & Vrancken (1995A&A...302..751H). For 26 out of 48 stars, a modeling of the total Hα emission, i.e. photospheric absorption plus disk net emission, has been attempted. By this modeling we derived an estimation of the disk radius, as well as the inclination angle between the rotational axis with line of sight and the base density at the stellar equator. For the stars observed more than once, we also discuss the variability of Hα and Hβ for what concerns both the equivalent width and the spectral profile. We found 16 stars with variable equivalent width and 7 stars with clear signs of profile variations. For all the stars in our sample, we derive all the fundamental astrophysical quantities, such as, effective temperature, gravity, and projected rotational velocity. We found 13 stars whose equivalent width is variable with a confidence level greater than 80% and 7 object for which spectral profiles show change with time. According to the commonly used classification scheme, we classified 16 stars as belonging to class 1, 13 to class 2, 11 are shell stars, 6 objects do not show net emission, and 2 stars display transitions from class 1 and 2. For the class 1 stars, we confirm the correlation between v sin i and peak separation. Concerning the geometry of the disk, we derived the base density at the stellar equator, the radius, and the inclination angle between rotational axis and line of sight. The maximum concentration of stars occurs for disk dimensions ranging in the interval of 6 to 8 stellar radii and for inclination angles going from 23° to 35°.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: fundamental parameters - atlases

VizieR on-line data: <Available at CDS (J/A+A/550/A79): stars.dat tableb1.dat sp/*>

Simbad objects: 51

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Number of rows : 51

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * phi And Be* 01 09 30.12562 +47 14 30.4594 3.84 4.18 4.25 4.22 4.27 B5IIIe 230 0
2 * phi Per Be* 01 43 39.6379209 +50 41 19.432832 3.10 4.02 4.06 3.90 3.88 B1.5V:e-shell 530 0
3 * eps Cas Be* 01 54 23.7261769782 +63 40 12.372216932 2.61 3.22 3.37 3.40 3.52 B3Vp_sh 178 0
4 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 695 0
5 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 388 1
6 HD 41335 Be* 06 04 13.5022124890 -06 42 32.225555101 4.31 5.14 5.21 5.13 5.09 B3/5Vnne 272 0
7 HD 43285 Be* 06 15 40.1770250717 +06 03 58.206069132 5.42 5.94 6.07     B6Ve 95 0
8 HD 44458 Be* 06 21 24.7160978834 -11 46 23.657723467 4.74 5.56 5.55 5.38 5.34 B1.5IVe 146 1
9 * nu. Gem Be* 06 28 57.7861342 +20 12 43.685624 3.51 4.00 4.14 4.17 4.28 B6IVe 236 0
10 HD 47054 Be* 06 36 35.3296957645 -05 12 40.100498706 5.05 5.44 5.52     B8IVe 92 0
11 HD 50820 Be* 06 54 42.0426161537 -01 45 23.313375761 6.44 6.77 6.21 5.52 4.82 B3IVe+K2II 90 0
12 * psi09 Aur Be* 06 56 32.0577542068 +46 16 26.402742904 5.36 5.81 5.87     B8IIIe 65 0
13 * 19 Mon bC* 07 02 54.7766724 -04 14 21.237679 3.87 4.80 5.00 5.06 5.25 B2Vn(e) 181 0
14 HD 53416 Be* 07 05 34.6788337125 +14 28 23.207351592   6.94 7.05     B8 21 0
15 HD 58020 PM* 07 20 51.6508101527 -53 46 12.202034953   9.26 8.73     F7V 3 0
16 HD 58050 Be* 07 24 27.6487089696 +15 31 01.916787310 5.39 6.23 6.41     B2Ve 117 0
17 HD 58343 Be* 07 24 40.1874154193 -16 12 05.299273325 4.52 5.15 5.19 5.05 5.06 B2Vne 201 0
18 * bet CMi Be* 07 27 09.0417373 +08 17 21.536745 2.52 2.80 2.89 2.90 2.96 B8Ve 360 0
19 HD 60855 Be* 07 36 03.8931197349 -14 29 33.982605315 4.87 5.58 5.70 5.72 5.81 B2Ve 128 0
20 HD 61224 Be* 07 37 38.8013059879 -14 26 26.743363583 6.22 6.491 6.516     B8/9IV 57 0
21 HD 65875 Be* 08 00 44.1334580605 -02 52 54.909780550 5.68 6.49 6.59 6.48 6.50 B2.5Ve 128 0
22 HD 71072 Be* 08 25 00.3966258428 -12 45 53.222278078   6.75 6.85     B4III/IV 32 0
23 HD 91120 Be* 10 30 59.8371633549 -13 35 18.495396994 5.38 5.54 5.58     B8/9IV/V 98 0
24 * kap Dra Be* 12 33 28.9420577565 +69 47 17.633094524 3.18 3.75 3.89 3.84 3.92 B6IIIe 353 0
25 * tet CrB Be* 15 32 55.78214 +31 21 32.8762 3.45 4.00 4.13 4.18 4.29 B6Vnne 276 0
26 * 4 Her Be* 15 55 30.5918031179 +42 33 58.287739693 5.23 5.64 5.75   5.82 B9pe 165 0
27 * 48 Lib Be* 15 58 11.3686950 -14 16 45.689426 4.61 4.77 4.87 4.91 4.96 B5IIIp_sh 425 0
28 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 692 0
29 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 525 0
30 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 245 0
31 HD 162428 Be* 17 50 01.2325679112 +24 28 05.083407413   7.016 7.098     B7IV/Vn(e)_(sh) 35 0
32 * z Her Be* 17 50 03.3350227341 +48 23 38.946882803 6.380 6.790 6.890     B6IIInp_sh 148 0
33 * 66 Oph Be* 18 00 15.7982457 +04 22 07.016285 3.77 4.58 4.60 4.47 4.49 B2Ve 326 0
34 HD 164447 Be* 18 00 27.6581882611 +19 30 20.831392519 5.960 6.370 6.430     B8Vn 68 0
35 HD 183362 Be* 19 27 36.3963023383 +37 56 28.304133698 5.46 6.20 6.34     B3Ve 101 0
36 HD 183656 Be* 19 30 33.1219944607 +03 26 39.858289092 5.69 6.064 6.082     B7III 120 0
37 * bet02 Cyg Be* 19 30 45.3960872028 +27 57 54.973848075 4.69 5.01 5.11     B8Ve 155 0
38 HD 187567 Be* 19 50 17.4789720907 +07 54 08.694058765 5.71 6.389 6.478     B2IVe 94 0
39 * 25 Cyg Be* 19 59 55.1955299208 +37 02 34.394909755 4.33 5.02 5.19     B3IVe 144 1
40 * b02 Cyg Be* 20 09 25.6190867940 +36 50 22.596147551 4.03 4.80 4.93     B2.5Ve 246 0
41 * 20 Vul Be* 20 12 00.7017606281 +26 28 43.698928217 5.38 5.81 5.92     B7Ve 103 0
42 * 25 Vul Be* 20 22 03.4307625256 +24 26 45.952640844 5.06 5.45 5.56 5.59 5.58 B6IVe 98 0
43 * 25 Peg Be* 22 07 50.3036328703 +21 42 10.530347500 5.27 5.68 5.78     B7Vne 109 0
44 * pi. Aqr Be* 22 25 16.6228499 +01 22 38.634579 3.64 4.60 4.64 4.48 4.48 B1III-IVe 384 0
45 * 8 Lac B * 22 35 52.0983894362 +39 37 41.331148560 4.61 5.52 5.67 5.88 6.06 B1.5Vs 104 0
46 HD 216057 Be* 22 48 47.8960650706 +54 24 53.613215610 5.54 6.037 6.124     B7V 80 0
47 * 14 Lac bL* 22 50 21.7772135639 +41 57 12.179527815 5.49 5.961 5.910     B4+F9III 139 0
48 HD 217050 Be* 22 57 04.5017623555 +48 41 02.641244743 4.81 5.34 5.43     B4IIIpe 316 1
49 HD 217543 Be* 23 00 54.7484721582 +38 42 28.235749172 5.78 6.43 6.54     B2.5Vn 98 0
50 * omi And Be* 23 01 55.2645930 +42 19 33.533383 3.00 3.53 3.62 3.61 3.69 B6IV/V_sh 411 0
51 * bet Psc Be* 23 03 52.6134921 +03 49 12.166213 3.90 4.40 4.52 4.54 4.67 B6Ve 236 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-03:05:46

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