Proposal #93

Proposer	(18792) Joseph Kalen (jkalen3345@comcast.net) obscode: KLN
Assigned To	(3663) Dirk Terrell
Date Submitted	Dec. 8, 2018
Status	Accepted
Priority	Normal
Proposal	Requester: Joseph Kalen membership: Member (Sustaining) obscode: KLN e-mail address: JKalen3345@comcast.net In two recent articles [Percy JR, Sparsely-Observed Pulsating Red Giants in the AAVSO Observing Program, JAAVSO, 46, 65-69, 2018] and [Karlsson T, et. al, 50 Forgotten Miras, JAAVSO, 44, 156-163, 2016] both authors list many pulsating red giant stars that are not regularly observed. Karlsson et.al demonstrated that additional observa-tions of these pulsating red giants can change the star classification, as demonstrated in the carbon star IV Peg, changed to SRa in the AAVSO database VSX. Reviewing the AAVSO LCGv2 data for three stars referred to in Percy 2018, one star within each star classification, (IV Peg, V521 Ori, and V360 Peg), there has been some V data, but a lack of B, Rc and Ic band data. This proposal is to add these photometric bands at least through two full cycles for the analysis of these red giants. Users plan for the data: AAVSO database Request image upload to VPHOT: Yes Filters: B-Johnson, V-Johnson, R-cousins, I-cousins; (60, 30, 24, 21) sec, For V360 Peg (30, 15, 12, 11 sec) Filter sequence: B, B, V, V, R, R, I, I, I, I, R, R, V, V, B, B Target; Classification; Period (d); Requested site; Cadence; Note (Percy 2018) IV Peg; SRa; 214.0; BSM_Berry; Weekly; new period gives a better phase curve than previous VSX V360 Peg; SR; 44.9; BSM_Berry; Weekly; RV Tau weak evidence V521 Ori; SRb; 221; BSM_NM; Weekly; new period gives a better phase curve than previous VSX Start plan as soon as possible and extend observations of the three targets through March 2021.

Targets
Target	RA (H.HH)	Dec (D.DD)	Magnitude	Telescope	Observation Frequency	Expiration Date	Proprietary Term
IV Peg	22.748133	18.11544	12.4–9.7	—	—	—	No
V360 Peg	23.808433	30.52747	8.6–8.0	—	—	—	1 Year
V521 Ori	5.738683	11.81319	12.4–10.9	—	—	—	No

Comments

(2911) Michael Nicholas — Dec. 10, 2018, 6:14 p.m.

It was pointed out by Arne that because IV Peg (B-V= 3.88) and V521 Ori (B-V= 1.98) are so red the exposures should be scaled by 50% of V for the R filter and 25% of V for the I filter.

(18792) Joseph Kalen — Jan. 30, 2020, 5:10 p.m.

Hi AAVSONet;

Thank you for the BSM_S images of V0521_Ori (dated 1/25/2020).
The I-filter exposure (10 s) is the same as the other BSM sites and results in a SNR of 92.
A mean of the 8 B-filters results in a SNR of 26 for an exposure of 80 sec, also the same exposure as the other BSM sites.

These exposures and SNR are reasonable.

Thank you;

Joseph Kalen

Comments on this proposal are closed.