1997A&AS..124...23P


Query : 1997A&AS..124...23P

1997A&AS..124...23P - Astron. Astrophys., Suppl. Ser., 124, 23-31 (1997/July-0)

Nonvariability among λ Bootis stars.

PAUNZEN E., KUSCHNIG R., HANDLER G., GELBMANN M. and WEISS W.W.

Abstract (from CDS):

With asteroseismic techniques it is possible to investigate the interior and the evolutionary status of stars via their frequency spectrum. Both information would be very much needed for λ Bootis stars, a group of metal-poor Population I, A-type stars, since no conclusive theory exists explaining the observed abundance anomalies. Geneva and Stroemgren photometry place these stars inside the classical instability strip or at least very close to it. We therefore have started an extensive photometric survey for pulsation in λ Bootis stars and have discovered so far 13 new variables. In this paper we present results for stars which presumably are constant, because we are able to establish only an upper level for possible variability. A typical noise level of 3mmag for Stroemgren b was achieved in the relevant frequency domain up to 100d–1. Considering the given noise level of our survey, we conclude that at least 50% of all investigated λ Bootis stars inside the instability strip are pulsating, making this group remarkable compared to stars with similar spectral types. This may suggest that a low (surface) metallicity has an influence on the pulsation behavior of stars. New models, as well as further observations are needed to clarify the λ Bootis phenomenon using asteroseismic techniques.

Abstract Copyright:

Journal keyword(s): astronomical data bases - surveys - stars - λ Bootis - stars - chemically peculiar - stars - early type

Simbad objects: 60

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Number of rows : 60
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 HD 203 PM* 00 06 50.0863238088 -23 06 27.145662264   6.547 6.173   5.74 F3V 120 0
2 HD 319 PM* 00 07 46.8995868600 -22 30 30.805174800   6.055 5.923     A1VbmA2_lB 100 0
3 HD 30913 * 04 51 57.1832485872 +09 52 21.739503720   7.19 6.83     F2 30 0
4 * g Ori ** 04 54 46.8951728160 +11 25 33.539033100   5.291 5.184     A3V 43 0
5 * pi.01 Ori PM* 04 54 53.7287660 +10 09 02.995200   4.723 4.648     A0Va_lB 250 0
6 * 131 Tau ** 05 47 13.1536316 +14 29 17.967416   5.785 5.721     A3Vn 99 0
7 * 137 Tau a2* 05 52 22.2914333688 +14 10 18.428386584   5.532 5.586     A0VpSiSrCr 101 0
8 HD 64142 PM* 07 46 18.2287655952 -71 43 13.075736736   7.97 7.57     F3V 26 0
9 HD 66168 PM* 07 56 09.1325142744 -71 59 09.107364696   8.49 7.93     F8V 42 0
10 HD 66920 * 07 59 15.7648072224 -73 14 39.015488508   6.470 6.327     A3III 28 0
11 * 45 Cnc ** 08 43 12.3294639552 +12 40 51.145063104 6.310 6.040 5.650     A3III:+G7III 49 0
12 * 50 Cnc PM* 08 46 56.0189914848 +12 06 35.830080180   5.992 5.885 7.20 5.76 A1Vp 87 0
13 HD 78326 ** 09 05 42.45472 -50 08 40.3111   7.80 7.78     A0IV/V 8 1
14 HD 79025 * 09 09 44.9967109272 -49 25 27.784888356   6.638 6.476     A3/5III(m) 28 0
15 HD 79622 * 09 13 31.1811449352 -49 05 40.343511480   8.16 6.62     K5III 14 0
16 HD 81290 Pe* 09 23 02.0651900592 -49 03 30.794478948   9.15 8.89     F4VkA3mA3_lB? 52 0
17 HD 81712 * 09 26 48.9048989280 -19 09 18.501982416   7.12 6.95     A7V 12 0
18 HD 82517 * 09 30 51.5866166040 -49 25 00.292378116   8.18 8.03     A2/3V 5 0
19 HD 82573 * 09 32 20.4086672088 -19 24 01.096523604   5.88 5.74     A4III 38 0
20 HD 82709 * 09 32 55.3188132840 -27 40 34.051065564   8.34 8.04     A9V 23 0
21 HD 82724 * 09 33 17.6738222400 -21 23 31.342317792   6.68 6.68     A0V 19 0
22 HD 83277 Pe* 09 36 31.8232900848 -27 57 45.149470020   8.57 8.29     F2VkA3mA3_lB? 41 0
23 HD 83547 * 09 38 30.0673583736 -27 59 06.602564076   8.69 8.63     A0V 11 0
24 * 32 LMi * 10 30 06.4476095952 +38 55 30.475814988   5.859 5.784     A4V 48 0
25 * 33 LMi * 10 31 51.3753968952 +32 22 46.405276428   6.001 5.905     A0Va- 67 0
26 * 34 LMi * 10 33 30.9110446608 +34 59 19.300642224 5.640 5.610 5.580     A2Vn 43 0
27 * kap02 Boo dS* 14 13 29.0076791664 +51 47 23.882850456   4.74 4.51     A7IV 152 0
28 * lam Boo dS* 14 16 23.0187965 +46 05 17.900526 4.31 4.26 4.18 4.16 4.13 A0Va_lB 339 0
29 * 25 Ser SB* 15 46 05.6365266672 -01 48 15.085342728 4.96 5.37 5.39     B8IV/V 109 0
30 * 30 Ser * 15 48 56.7969566256 -03 49 06.637937808   5.646 5.524     A5IV-V 74 0
31 * b Ser ** 15 51 15.5941805 -03 05 25.793806   5.23 5.10     A2IV-Vn 109 0
32 HD 142542 * 15 56 14.0306770776 -31 47 09.171584340   6.718 6.284     F3/5V 36 0
33 HD 142851 * 15 57 59.3452136400 -31 43 44.143237524   6.99 7.02     A0V 40 0
34 HD 143148 * 15 59 49.8381691512 -31 50 06.956208600   7.67 7.39     A7III/IV 20 0
35 * iot02 Nor PM* 16 09 18.5476443528 -57 56 03.548808456   5.541 5.570     B9.5V 37 0
36 HD 145782 PM* 16 15 49.7975006976 -57 54 44.457871500   5.744 5.622     A3III 30 0
37 * 34 Her PM* 16 30 06.0391855416 +48 57 39.908230668   6.457 6.427     A1V 34 0
38 HD 149303 * 16 31 47.2275879216 +45 35 53.744910612 5.850 5.78 5.68 7.16   A2Vn_lB 60 0
39 * sig Her ** 16 34 06.1824264648 +42 26 13.234150680   4.177 4.196 6.02   B9V 189 0
40 HD 153234 SB* 17 00 14.2435219056 -44 59 18.715779600   6.868 6.494     F3V 27 0
41 HD 154025 * 17 05 05.3673156312 -45 30 07.658511840   6.340 6.268     A2V 25 0
42 HD 154153 * 17 05 48.4627188912 -44 06 18.186019740   6.450 6.178     F1VkA3mA3_lB? 55 1
43 HD 156392 * 17 17 51.7720780512 -12 18 47.286764676   8.84 8.38     F2V 24 0
44 HD 156954 * 17 21 00.3553285752 -13 05 07.621955772   7.97 7.67     F0.5VkA9mA9 43 1
45 HD 171569 * 18 34 46.9663160616 +21 29 10.474541088   7.27 7.21     A0 9 0
46 HD 171799 * 18 35 55.7267445312 +22 45 19.995001704   7.82 7.63     A0 7 0
47 HD 171948 SB* 18 36 37.0229804112 +22 06 27.294803964   6.82 6.77     B9 35 1
48 * 19 Aql PM* 19 08 59.9147881896 +06 04 23.584037700 5.590 5.570 5.230     F0III-IV 86 0
49 HD 179791 V* 19 13 44.0319885648 +05 30 56.198549232 6.69 6.58 6.49     A3V 51 0
50 * 22 Aql * 19 16 31.0314249432 +04 50 05.256444156   5.646 5.569     A1V 44 0
51 HD 188097 PM* 19 58 41.2906918272 -69 09 50.240341692   5.954 5.724     A1mA5-F2 45 0
52 HD 188164 SB* 19 58 52.9850408208 -68 45 45.297814464   6.529 6.374     A6VkA2mA3 42 0
53 HD 192424A * 20 14 04.5288848660 +22 13 21.532093379   7.92 7.88     A0 25 0
54 HD 193256 * 20 20 26.5730016024 -29 11 28.700728368   7.703 7.525 8.49   A8VnkA3mA3(_lB) 63 0
55 HD 193281 * 20 20 27.8803232880 -29 11 49.972752276   6.76 6.64 7.50   A2IV-V 95 0
56 HD 193668 * 20 20 42.1112924928 +22 16 36.391253556   6.99 7.06     B9 10 0
57 HD 194170 * 20 25 08.1711474960 -28 51 44.948106936   8.61 8.41     A3/4V 6 0
58 HD 203405 * 21 21 50.3203957488 +01 21 41.837147712   7.16 6.79     F2IV/V 22 0
59 HD 204041 PM* 21 25 51.5848015320 +00 32 03.634403820   6.593 6.450     A1Vb 100 0
60 HD 204121 PM* 21 26 28.0527489888 +01 06 12.088012536       5.9   F5V 88 0

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2022.11.28-03:38:53

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