AAVSO: American Association of Variable Star Observers

Proposal #265

Proposer (36547) Lauren Herrington (lherrington@aavso.org) obscode: HLAA
Assigned To(3663) Dirk Terrell
Date SubmittedMay 27, 2022

Red supergiants (RSGs) are variable spectroscopically as well as photometrically, yet many of the brightest RSGs are currently underobserved, with few or no spectra available in AVSpec. In the short term, increased spectroscopic monitoring by amateurs has the potential to provide valuable data to professionals working in the fields of RSG mass loss and dust production, chemical enrichment of the interstellar medium, the search for Thorne-Zytkow objects, and more. In addition, it is currently understood that all red supergiants will inevitably go supernova; so in the long term, any quality spectroscopic data collected on the progenitor star will eventually become of extreme importance to the scientific community.

This proposal includes a list of 16 red supergiants which appear brighter than magnitude 7 and are well placed for viewing from the southern hemisphere. These stars would be excellent targets for a medium- to high-resolution echelle spectrograph matched to a large telescope, such as the eShel instrument on AAVSOnet observatory OC61.

The resulting spectra will be reduced by AAVSO observers Lauren Herrington (HLAA) and Brad Young (YBA), then uploaded to AVSpec.

A table of information about each star (including sexagesimal coordinates), compiled using VSX, is available at the following link: https://docs.google.com/spreadsheets/d/1SFZMxUG--IvEQfqMRI3J7FYtm_aRzWSmINQ7e8N8F54/edit?usp=sharing

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
NSV 9929 17.984722 -30.25306 5.14–5.24 No
NSV 24050 17.951944 -23.93917 6.54–6.68 No
NSV 23546 17.723889 -35.29778 6.91–7.03 No
BM Sco 17.683056 -32.21444 5.25–6.46 No
alf Sco 16.490000 -26.43194 0.75–1.21 No
NSV 4720 10.046944 -62.15667 6.38–6.43 No
AB Pyx 8.508333 -36.72139 6.37–6.98 No
NS Pup 8.189167 -39.61861 4.4–4.46 No
QY Pup 7.794167 -15.99083 6.22–6.71 No
KQ Pup 7.563333 -14.52389 4.82–5.17 No
VY CMa 7.382778 -25.76750 6.5–9.6 No
NSV 3503 7.276944 -23.31556 4.78–4.89 No
sig CMa 7.028611 -27.93472 3.41–3.51 No
Omi 1 CMa 6.902222 -24.18417 3.78–4.09 No
alf Ori 5.919444 7.40694 0.0–1.6 No
NSV 13 0.075000 -10.50944 4.99–4.995 No


(3663) Dirk Terrell — May 27, 2022, 10:28 p.m.

The TAC has approved this proposal but we need to develop a procedure for using the system manually since ACP can't do automated spectroscopy. Arne says:
"I'm happy to help out, and maybe we can do this after my June trip to SAS. I get back ~June9, and would need a few nights to set things up and develop a cookbook procedure."

Comments on this proposal are closed.