2020JAVSO..48...31P

Query : 2020JAVSO..48...31P

2020JAVSO..48...31P - J. Am. Assoc. Variable star obs., 48, 31 (2020)

ASAS-SN Observations of Long Secondary Periods in Pulsating Red Giants.

PERCY J. and WALLACE A.M.

Abstract (from CDS):

About a third of all pulsating red giants (PRGs) have long secondary periods (LSPs), an order of magnitude longer than their pulsation periods (P). Although LSPs have been known for many decades, their nature and cause are uncertain. We have analyzed data on 45 PRGs, from the All-Sky Automated Survey for Supernovae (ASAS-SN), and combined the results with data from the literature to draw a few new conclusions about this phenomenon. LSPs have V amplitudes of up to 0.45 mag. The ratio LSP/P has a peak at 10 ± 1, and a broader distribution at 7 ± 1. There is no obvious correlation between LSP/P and LSP itself. Previous studies have suggested that the pulsation amplitude does not vary around the LSP cycle, but varies on longer time scales of 20{Ux0096}45 P. However, we find smaller variations in pulsation amplitude around the LSP cycle, which may be partly due to the effect of the LSP variations on the pulsation amplitude determination, but otherwise appear to be real and common.

Abstract Copyright: ∼

Journal keyword(s): stars - stars: late-type - techniques: photometric - methods: statistical - stars: variable - stars: oscillations

Simbad objects: 45

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Number of rows : 45
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 ATO J040.9725+38.5988 AB? 02 43 53.4215543659 +38 35 55.726480365           M5.0III 9 0
2 ASASSN-V J041209.77-581525.7 LP* 04 12 09.7505989944 -58 15 25.316115588   13.47 11.84 11.33 9.55 ~ 7 0
3 ASASSN-V J042558.31+224004.7 LP* 04 25 58.3294981152 +22 40 04.641287232   14.953 12.717 12.645   M3.0III 7 0
4 WOH G 7 LP? 04 26 58.9661058264 -70 54 00.974774232   12.949 11.450 11.092   M: 9 0
5 ATO J069.4355+53.8846 LP* 04 37 44.5576254532 +53 53 04.628507742   15.417 13.097 12.421   M4.0III 5 0
6 ASASSN-V J050943.86+072725.6 LP? 05 09 43.8358838985 +07 27 25.166828270   13.615 11.773 11.397   ~ 2 0
7 ASASSN-V J060912.35-142851.3 LP* 06 09 12.3526624699 -14 28 51.233404079   14.794 13.084 12.702   ~ 3 0
8 IRAS 06114-4941 LP? 06 12 44.2295504952 -49 42 17.931635604   12.84 11.58 11.261   ~ 4 0
9 ASASSN-V J065430.46-024530.5 LP* 06 54 30.4482759225 -02 45 30.722579516       12.402   ~ 3 0
10 ASASSN-V J071807.32-580600.5 LP* 07 18 07.3194218880 -58 06 00.448115652   15.802 14.054 13.276 10.61 ~ 9 0
11 C* 757 C* 07 26 11.5288147584 -05 11 12.656869656   14.999 11.443 10.572   C 14 0
12 ASASSN-V J073046.65-642648.2 LP* 07 30 46.6432848840 -64 26 48.249358584   15.262 13.504 13.081 10.93 ~ 11 0
13 IRAS 07355-7603 LP* 07 33 56.9255688360 -76 10 29.459380008   13.630 11.967 11.562   ~ 8 0
14 ASAS J075230-0659.5 LP* 07 52 29.7757161912 -06 59 27.436677180   14.521 12.830 12.212   ~ 7 0
15 IRAS 08507-3856 LP? 08 52 41.0951114496 -39 08 10.287154212       15.825   M8: 4 0
16 ATO J140.3913-30.4059 LP* 09 21 33.9353748430 -30 24 21.504449242   16.551 14.559 13.107   ~ 5 0
17 ASASSN-V J101642.40-324246.4 LP* 10 16 42.4442351160 -32 42 46.148799924   14.264 12.600 12.249 10.53 ~ 6 0
18 ASASSN-V J102404.50-424432.1 SB* 10 24 04.4848560264 -42 44 32.242328556   14.440 12.678 12.196 10.39 ~ 10 0
19 WRAY 18-244 S* 12 07 33.2241337176 -57 25 01.508120148   13.272 11.281 10.840   S 10 0
20 IRAS 14354-6210 LP* 14 39 22.7572134384 -62 22 55.355751876       15.807   ~ 3 0
21 [D75] 46 LP? 16 02 47.1433924704 -26 25 23.625310944   16.30 13.52 13.18   M7 4 0
22 2MASS J16502765-6706237 LP* 16 50 27.6365970012 -67 06 23.802777744   15.423 13.829 13.211   ~ 3 0
23 ASASSN-V J165443.03-674130.3 LP? 16 54 42.9821711952 -67 41 30.125700465   14.552 12.863 12.414   ~ 2 0
24 ASASSN-V J173343.90-491900.9 LP* 17 33 43.9319954819 -49 19 01.467881295   15.645 13.798 13.544   ~ 2 0
25 ASASSN-V J175204.29-505333.5 LP* 17 52 04.1451734595 -50 53 34.705213263       11.333   ~ 3 0
26 ASASSN-V J180342.74-541714.9 LP* 18 03 42.7330347312 -54 17 14.825656752   14.926 13.393 12.328 9.66 ~ 6 0
27 ASASSN-V J181621.36-624528.8 LP* 18 16 21.4005120288 -62 45 28.815292908   14.149 12.472 12.305   ~ 4 0
28 2MASS J18314084-3423395 LP* 18 31 40.8391398540 -34 23 39.620588041       13.835   ~ 3 0
29 IRAS 18388-0746 LP* 18 41 35.3610219960 -07 43 59.416584888       14.590   ~ 6 0
30 ASASSN-V J185021.64-372919.3 LP? 18 50 21.5942572963 -37 29 18.712613458   14.221 12.850 13.497   ~ 2 0
31 ASASSN-V J190727.12-115432.9 LP? 19 07 27.1307946549 -11 54 33.058284954   16.020 14.011 13.264   ~ 2 0
32 2MASS J19073650-2832522 LP* 19 07 36.4907359583 -28 32 52.151607921   14.357 12.611 12.228   ~ 3 0
33 ROTSE1 J191616.27+475825.4 LP* 19 16 16.3502225496 +47 58 23.734646904     12.505   9.972 M3III 19 0
34 ASASSN-V J192322.36+132404.5 LP* 19 23 22.3293157270 +13 24 04.534983441   15.324 13.056 12.159   ~ 3 0
35 ATO J299.1574+07.5486 LP* 19 56 37.8009400639 +07 32 55.056361499       13.172   ~ 6 0
36 ZTF J200517.76+152705.6 LP* 20 05 17.7775829483 +15 27 05.790370559   15.033 13.350 12.770   ~ 6 0
37 V* V1823 Aql LP* 20 08 30.6133535184 -02 45 58.337118324   15.634   13.290 11.39 ~ 5 0
38 ASASSN-V J200906.21-360621.9 LP* 20 09 06.2781369384 -36 06 21.840598332       12.350 10.16 ~ 7 0
39 IRAS 20125-5153 LP* 20 16 17.9359725048 -51 44 26.744549424       11.495   ~ 8 0
40 V* OY Del LP* 20 17 49.8812288160 +10 16 29.833091184   16.312 14.517 13.960   ~ 5 0
41 ASAS J202347+2309.5 LP* 20 23 46.8299496912 +23 09 28.415706228       12.156   ~ 5 0
42 [WWV2004] J2025076+131355 LP* 20 25 07.6490297544 +13 14 00.162801744   15.102 13.542 12.825   ~ 6 0
43 IRAS 20245+1916 LP* 20 26 51.3177405696 +19 26 39.957046008   13.630 11.786 11.225   ~ 4 0
44 ASASSN-V J221339.54+250026.2 LP* 22 13 39.4444915155 +25 00 26.132672032   13.281 11.525 11.110   ~ 2 0
45 IRC +20533 LP* 22 39 01.9507734216 +21 07 56.303171256   13.453 11.831 10.847   M7 6 0

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