2006A&A...455..659A

Query : 2006A&A...455..659A

2006A&A...455..659A - Astronomy and Astrophysics, volume 455659-672 (2006/8-4)

Dwarf novae in the Hamburg quasar survey: rarer than expected.

AUNGWEROJWIT A., GAENSICKE B.T., RODRIGUEZ-GIL P., HAGEN H.-J., ARAUJO-BETANCOR S., BAERNBANTNER O., ENGELS D., FRIED R.E., HARLAFTIS E.T., MISLIS D., NOGAMI D., SCHMEER P., SCHWARZ R., STAUDE A. and TORRES M.A.P.

Abstract (from CDS):

We report the discovery of five new dwarf novae that were spectroscopically identified in the Hamburg Quasar Survey (HQS), and discuss the properties of the sample of new dwarf novae from the HQS.Follow-up time-resolved spectroscopy and photometry have been obtained to characterise the new systems.The orbital periods determined from analyses of the radial velocity variations and/or orbital photometric variability are Porb≃105.1min or Porb≃109.9min for HS0417+7445, Porb=114.3±2.7min for HS1016+3412, Porb=92.66±0.17min for HS1340+1524, Porb=272.317±0.001min for HS1857+7127, and Porb=258.02±0.56min for HS2214+2845. HS1857+7127 is found to be partially eclipsing. In HS2214+2845 the secondary star of spectral type M3±1 is clearly detected, and we estimate the distance to the system to be d=390±40pc. We recorded one superoutburst of HS0417+7445, identifying the system as a SU UMa-type dwarf nova. HS1016+3412 and HS1340+1524 have rare outbursts, and their subtype is yet undetermined. HS1857+7127 frequently varies in brightness and may be a ZCam-type dwarf nova. HS2214+2845 is a UGem-type dwarf nova with a most likely cycle length of 71d. To date, 14 new dwarf novae have been identified in the HQS. The ratio of short-period (<3h) to long-period (>3h) systems of this sample is 1.3, much smaller compared to the ratio of 2.7 found for all known dwarf novae. The HQS dwarf novae display typically infrequent or low-amplitude outburst activity, underlining the strength of spectroscopic selection in identifying new CVs independently of their variability. The spectroscopic properties of short-period CVs in the HQS, newly identified and previously known, suggest that most, or possibly all of them are still evolving towards the minimum period. Their total number agrees with the predictions of population models within an order of magnitude. However, the bulk of all CVs is predicted to have evolved past the minimum period, and those systems remain unidentified. This suggests that those post-bounce systems have markedly weaker Hβ emission lines compared to the average known short-period CVs, and undergo no or extremely rare outbursts.

Abstract Copyright: ∼

Journal keyword(s): stars: dwarf novae - stars: individual: HS0417+7445 - stars: individual: HS1016+3412 - stars: individual: HS1340+1524 - stars: individual: HS1857+7127 - stars: individual: HS2214+2845

Simbad objects: 65

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Number of rows : 65
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 USNO-A2.0 1575-00200971 * 00 22 45.36600 +73 57 51.9600   13.3 17.9 13.3   ~ 1 0
2 V* WX Cet CV* 01 17 04.1794193856 -17 56 22.414606224           ~ 173 0
3 HS 0139+0559 CV* 01 41 39.9217828176 +06 14 37.494706740   14.9 15.4     DA 21 0
4 V* KV And CV* 02 17 13.9016014378 +40 41 29.665114908           ~ 29 0
5 HS 0229+8016 CV* 02 35 58.2097250160 +80 29 44.285975556   13.9 13.9     ~ 21 0
6 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   DA 453 0
7 USNO-A2.0 1575-02008711 * 04 23 16.07300 +74 52 28.9300   14.9 14.2 13.6   ~ 1 0
8 HS 0417+7445 CV* 04 23 32.8345501088 +74 52 50.037845263           ~ 27 0
9 V* FS Aur CV* 05 47 48.3599178816 +28 35 11.207992848           ~ 121 0
10 V* LU Cam CV* 05 58 17.8724217408 +67 53 46.056395580           ~ 22 0
11 V* CZ Ori CV* 06 16 43.2247568736 +15 24 11.297210616   12.81 12.81 16.17   OB- 108 0
12 HS 0642+5049 CV* 06 46 19.6073560896 +50 45 49.211945352   16.6 16.8     ~ 19 0
13 V* BX Pup CV* 07 54 15.5733669984 -24 19 36.404794884           ~ 48 0
14 V* U Gem CV* 07 55 05.2324414746 +22 00 05.044127985   15.3 14.54     DA 1135 0
15 V* SU UMa CV* 08 12 28.2695986944 +62 36 22.427676396           B2 516 0
16 V* Z Cam CV* 08 25 13.1986690656 +73 06 39.284964108   12.006 11.927 11.712   ~ 554 0
17 V* CC Cnc CV* 08 36 19.1533707432 +21 21 05.426956908           ~ 63 0
18 V* SW UMa CV* 08 36 42.7492998204 +53 28 37.976599017           ~ 315 0
19 V* GY Cnc CV* 09 09 50.5407550968 +18 49 47.429496300           ~ 87 0
20 PG 0911-066 CV* 09 14 14.0293028112 -06 47 44.773184220   17.6   19.1   ~ 45 0
21 V* GZ Cnc CV* 09 15 51.6769229568 +09 00 49.657853448           ~ 48 0
22 V* HM Leo CV* 09 38 36.9804137328 +07 14 55.122280584           ?+M3V 30 0
23 RX J0944.5+0357 CV* 09 44 31.6813494432 +03 58 05.300563116   17.525 17.019 15.574   M2V 42 0
24 V* ER UMa CV* 09 47 11.9410111200 +51 54 08.950092804 14.351 14.03 13.91 14.909 14.629 ~ 161 0
25 USNO-A2.0 1200-06495553 * 10 19 43.07700 +33 56 42.2100   15.0 14.7 14.3   ~ 1 0
26 1RXS J101946.7+335811 X 10 19 46.7 +33 58 11           ~ 1 0
27 V* AC LMi CV* 10 19 47.2794203328 +33 57 53.643988296     17.5     ~ 23 0
28 V* KS UMa CV* 10 20 26.5185297792 +53 04 33.089641968   17.0       ~ 75 0
29 V* ST LMi CV* 11 05 39.7664319408 +25 06 28.746723096   16.832 16.524 15.639   DAH+M 228 0
30 V* AR UMa CV* 11 15 44.5891034908 +42 58 22.431026739     16.4     O9I 154 0
31 V* RZ Leo CV* 11 37 22.2524330304 +01 48 58.617459936     19.6     DA+dM2 170 0
32 V* QZ Vir CV* 11 38 26.8241432424 +03 22 07.110298596     15.81     ~ 269 1
33 V* BC UMa CV* 11 52 15.8342499696 +49 14 41.887768632           DC: 112 0
34 V* HV Vir CV* 13 21 03.1661521320 +01 53 29.075499492           DA 162 0
35 UCAC4 526-056021 * 13 43 19.1039030741 +15 10 18.563812082   14.396 13.674 13.730   ~ 1 0
36 V* HW Boo CV* 13 43 23.1746633496 +15 09 16.825941036     18.5     ~ 24 0
37 UCAC4 526-056022 * 13 43 24.8862182188 +15 08 08.963485876       15.881   ~ 1 0
38 USNO-A2.0 1050-06992410 * 13 43 30.45100 +15 12 03.7300   16.4 15.4 14.4   ~ 1 0
39 V* UZ Boo CV* 14 44 01.2123285360 +22 00 54.812924316           ~ 78 1
40 V* KV Dra CV* 14 50 38.3283335160 +64 03 29.003633136           DQ 38 0
41 V* GW Lib No* 15 19 55.3333785336 -25 00 24.614534520           DA: 228 0
42 Ross 513 PM* 15 35 20.5212300654 +17 42 46.882017401   13.98   12.055   M2.5V 69 1
43 PG 1550+191 CV* 15 52 47.1968971224 +18 56 28.844471472   16.4 15.46 17.0   M6.5Ve 202 0
44 V* AP CrB CV* 15 54 12.3454476576 +27 21 52.290975024     16.87 16.5   M3 47 0
45 V* V544 Her CV* 16 38 05.3888939352 +08 37 58.442314368           ~ 30 0
46 V* EX Dra No* 18 04 14.2485669582 +67 54 12.273781393   14.775 14.479 14.490   ~ 135 0
47 USNO-A2.0 1575-04072972 * 18 57 07.89300 +71 32 47.1900   13.5 12.8 12.2   ~ 1 0
48 USNO-A2.0 1575-04073098 * 18 57 10.06200 +71 31 28.6900   14.8 14.3 13.8   ~ 1 0
49 HS 1857+7127 CV* 18 57 20.3720889336 +71 31 18.849699480           ~ 10 1
50 1RXS J185722.6+713126 X 18 57 22.6 +71 31 26           ~ 1 0
51 USNO-A2.0 1575-04073991 * 18 57 23.79600 +71 30 20.0600   14.9 14.4 13.8   ~ 1 0
52 V* V587 Lyr CV* 19 17 26.4560501112 +37 10 40.656436428           ~ 11 0
53 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20 10.817   D 982 0
54 V* AO Oct CV* 21 05 08.1778533822 -75 21 03.305008201           ~ 28 0
55 V* CF Gru CV* 21 41 22.9388617632 -45 04 31.289520432           ~ 17 0
56 HS 2214+2845 CV* 22 16 31.1750292600 +29 00 19.821789252           M2.5e 15 0
57 [WXD99] J221631.29+290016.1 X 22 16 31.3 +29 00 26           ~ 3 0
58 USNO-A2.0 1125-19198939 * 22 16 33.62500 +28 58 18.5500   14.8 14.2 13.7   ~ 1 0
59 USNO-A2.0 1125-19199670 * 22 16 37.62700 +29 00 56.5000   15.6 15.3 15.0   ~ 1 0
60 V* V521 Peg CV* 22 21 44.7931808160 +18 40 08.201442360           ~ 35 0
61 HS 2237+8154 WD* 22 37 15.5608684464 +82 10 27.358012308           DA2.8 23 0
62 GD 552 CV* 22 50 39.9583863216 +63 28 38.330366988   16 16.47     D 74 0
63 V* IP Peg CV* 23 23 08.5362249504 +18 24 59.206884012           M2 395 0
64 V* V455 And CV* 23 34 01.4484962496 +39 21 40.866079356   16.220 16.094 16.137   DQ 166 0
65 V* BW Scl CV* 23 53 00.8741941392 -38 51 46.662458688   16.7       D 85 0

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