2003ApJ...584.1035O


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST14:15:46

2003ApJ...584.1035O - Astrophys. J., 584, 1035-1041 (2003/February-3)

On the origin of long secondary periods in semiregular variables.

OLIVIER E.A. and WOOD P.R.

Abstract (from CDS):

The presence of a long secondary period (LSP) in the light curves of some local semiregular variables has been known for many years. Furthermore, the LSPs have recently been found in the light curves of approximately 25% of the semiregular variables in the LMC. They typically have a length of ∼500-4000 days, some 5-15 times longer than the primary period. Binarity, pulsation, periodic dust ejection, and rotation have been suggested as the origin of the LSPs. Here we analyze echelle spectra of a group of local semiregular variables with LSPs (hereafter LSPVs) in order to try to distinguish between these suggestions. In general, we find that LSPVs do not have broader spectral features than semiregulars without a long secondary period (hereafter non-LSPVs). The general upper limit on the equatorial rotation velocity of 3 km/s rules out rotating spot and similar models. One LSPV, V Hya, does have broader spectral lines than similar carbon stars, but it is shown here that rotation alone is not a good model for explaining the broad lines. Mid-infrared colors of LSPs and non-LSPVs are similar and there are no LSPVs showing the large (60-25) µm IRAS color exhibited by some R Coronae Borealis (RCB) stars. Thus, there is no evidence for periodic dust ejection from LSPVs. Finally, we find that the LSPVs show larger radial velocity variations than non-LSPVs, which suggests that LSPs are caused either by binarity or by pulsation. A similar conclusion was derived by Hinkle and co-workers.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Galaxies: Magellanic Clouds - Stars: Variables: Other

Simbad objects: 57

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Number of rows : 57

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* AG Cet LP* 00 28 00.5464119027 -11 39 31.682433658   8.56 7.36     M5III 41 0
2 V* Z Eri LP* 02 47 55.9216430852 -12 27 38.316879302 9.83 8.46 6.90     M5III 105 0
3 V* RR Eri LP* 02 52 14.1851309337 -08 16 01.423526289   8.59 7.16     M5III 48 0
4 V* SU Eri LP* 03 51 27.0196461124 -01 22 16.279307867   9.71 8.545 8.27   M6III 27 0
5 V* V Eri AB* 04 04 18.7986928435 -15 43 30.458637226   9.96 8.59     M7+II: 78 0
6 V* T Cae C* 04 47 18.9238883495 -36 12 33.572294540 13.27 10.05 7.73     C-N4IV: 53 0
7 V* W Ori C* 05 05 23.7201883024 +01 10 39.459119918 16.36 9.52 6.10 3.83 2.35 C-N5 278 0
8 V* RX Lep AB* 05 11 22.8715425 -11 50 56.722211 8.37 7.14 5.68     M6III 95 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15285 1
10 V* RT Ori C* 05 33 13.7455793903 +07 09 12.433864421   10.8 9.70     C-N5 72 1
11 V* Y Tau C* 05 45 39.4116657307 +20 41 42.150008983 15.71 9.90 6.90 4.69 3.19 C-N5- 215 1
12 V* S Lep LP* 06 05 45.5492216726 -24 11 44.028071527 9.72 8.42 6.82 4.12 1.75 M6+IIIa 99 0
13 V* GK Ori C* 06 17 42.0948554151 +08 31 11.392091128     9.50     C-N5- 54 0
14 V* SX Mon LP* 06 51 57.3263996242 +04 45 52.517037667   8.94 7.66     M5III 12 0
15 V* RV Mon C* 06 58 21.4890395542 +06 10 01.560306362   10.4 7.47     C4,5 95 1
16 V* RY Mon C* 07 06 56.4751624597 -07 33 26.504953250   11.94 7.50     C-N5 88 0
17 V* CO CMa LP* 07 14 00.9867645546 -26 06 34.942638181   9.451 9.70 7.49   M3IIIe 13 0
18 V* GH CMa LP* 07 22 23.0906269308 -20 30 23.965452120   8.478 7.053     M4III 29 0
19 * 27 Cnc LP* 08 26 43.9403482194 +12 39 16.606623628 9.02 7.10 5.50 3.88 2.47 M3IIIa 66 0
20 V* GO Vel LP* 08 37 39.6871865940 -40 26 08.080741990   8.575 6.979     M4III 26 0
21 V* AK Hya LP* 08 39 53.5444613592 -17 18 10.707180032   8.00 6.67     M6III 71 0
22 V* RT Cnc LP* 08 58 15.9999114192 +10 50 42.674063993 10.04 8.97 7.52     M5III 53 1
23 V* SY Vel LP* 09 12 25.7255513096 -43 46 38.697659266   9.40 8.12     M5/6III 20 0
24 V* IN Hya LP* 09 20 36.6812592419 +00 10 54.151488956   8.287 6.698     M3/4III 44 0
25 V* SZ Vel LP* 09 50 07.4028271209 -44 39 07.565208377   10.68 9.36     M5 12 0
26 V* Y Hya C* 09 51 03.7183623740 -23 01 02.359218355 17.75 10.45 6.63     C-N4.5III: 105 0
27 V* SU Hya LP* 09 53 43.2767939691 -21 50 41.487585427   10.99 9.591     M4III 6 0
28 V* IO Hya LP* 10 07 32.1710542758 -22 29 22.607315826   8.56 7.11     M4III 21 0
29 V* CK Car s*r 10 24 25.3599153588 -60 11 29.037410779   9.63 7.59     M3.5Iab 54 0
30 V* U Hya C* 10 37 33.2729535 -13 23 04.352923 13.29 7.51 4.82 3.05 1.78 C-N5 289 0
31 V* V Hya C* 10 51 37.2614060865 -21 15 00.339641553   12.23 6.80     C-N:6 344 0
32 V* BZ Car LP* 10 54 06.2514210504 -62 02 32.815833011 11.90 9.89 7.71     M3+Ib 49 0
33 V* RW Cen C* 11 07 17.8664216302 -55 07 19.063691631   11.65 8.78     C 19 0
34 V* T Crt LP* 11 23 53.0054377423 -19 54 30.263965139   10.00 8.79     M6III 27 0
35 V* RR Crt LP* 11 31 41.2017902307 -12 22 52.941518390   11.17 10.00     M5 9 0
36 * C01 Cen LP* 11 35 13.2813376689 -47 22 21.288761350   7.299 5.675     M3/4III 49 0
37 V* RR Mus C* 11 39 25.0802541789 -72 33 36.811808592   11.2 11.30     C 24 0
38 V* T Mus C* 13 21 13.8451351568 -74 26 30.979738249   10.9 9.40     C-J4.5 46 0
39 V* EV Vir LP* 14 13 09.7750234947 -13 51 35.744605288   8.43 6.88     M4-M4.5II-III 51 0
40 V* AN Vir LP* 14 18 00.3549454282 -14 42 23.221534286   9.97 8.68     M6III 18 0
41 V* V Nor LP* 16 10 01.7229727709 -49 14 12.061959355   12.11 10.00     M5III 20 0
42 V* W Nor LP* 16 16 42.4820042740 -52 36 13.707831386   10.39 10.30     M4/5(III) 14 0
43 V* V520 Oph Mi* 17 22 52.8787652583 -29 12 43.363051564   12.23 10.04     K0 7 0
44 V* V521 Oph S* 17 23 48.8966 -28 28 47.476   11.81 9.72     S5,4 31 0
45 V* TW Oph C* 17 29 43.6641693394 -19 28 22.867073875   12.95 8.79 7.54 8.70 C-N5 111 0
46 V* V Pav C* 17 43 18.9385755525 -57 43 26.280846211   10.11 6.673 7.14 8.88 C6,4 63 0
47 V* V574 Oph Mi* 18 06 15.5211104659 +03 24 08.937610086   11.11 9.84     M5 13 0
48 V* TY Oph C* 18 31 23.2677344529 +04 22 53.956815735   13.10 12.70     C-N5+ 53 0
49 V* RT Pav LP* 18 36 30.5354131841 -69 53 06.090257686   9.56 8.20     M4/5III 17 0
50 V* V515 Oph LP* 18 39 33.0933937851 +11 50 39.140492028   12.11 10.61     K2 10 0
51 V* UV Aql C* 18 58 32.4282994521 +14 21 49.596852833   14.65 11.10 9.30 7.83 C5,3 69 0
52 V* V Aql C* 19 04 24.1548619887 -05 41 05.434251344   11.09 6.90     C-N5 207 0
53 V* EI Del LP* 20 26 14.2996003033 +05 12 12.313960940   11.59 9.83     M2 6 0
54 V* V Aqr LP* 20 46 49.3617839507 +02 26 15.235417910   9.73 8.53     M5/6(III) 44 0
55 V* Y Pav C* 21 24 16.7498446696 -69 44 01.965339111 12.63 9.23 6.41     C7,3 79 0
56 V* SX Pav LP* 21 28 44.9248387 -69 30 19.389360   6.97 5.62     M5III 41 0
57 V* BM Aqr LP* 22 06 44.9839828143 -15 38 40.123263270   11.62 10.00     M3(III) 16 0

    Equat.    Gal    SGal    Ecl

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2021.04.14-14:15:46

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