Proposal #464

Proposer	(38172) Ari M. Siqueira (ari.m.siqueira@icloud.com) obscode: SAMA
Assigned To	(3663) Dirk Terrell
Date Submitted	Nov. 25, 2023
Status	Allocated
Priority	Normal
Proposal	I request time in one of the AAVSOnet Faint Star Monitor telescopes to obtain photometric data of LDN 1641 North, a cluster in the Orion constellation, a region consisting of several active star-forming sub-regions. There are some interesting dynamics going on in this deep sky object and a number of young stars shining on structures of the nebula present in and around this cluster. The L1641-N region is one of the well-studied, nearby star-forming regions (Allen, L. E. & Davis, C. J. 2008, Low Mass Star Formation in the Lynds 1641 Molecular Cloud, in Handbook of Star Forming Regions Vol. 1, eds. Bo Reipurth, Astro. Soc. of Pacific, p. 621-661). It lies just south of the clouds known as OMC-4 and OMC-5, making up a northern part of the L1641 molecular cloud, one of the several ∼ 104M⊙ molecular clouds contained within the Orion A giant molecular cloud complex. There follows some information on the target and its desired monitoring: LDN 1641 North ICRS midpoint coords. J2000: R.A. 05 36 19.0 Dec. -06 22 12. LDN 1641 North boundaries: R.A. 05:34:30 to 5:37:30; Dec. -7:00:00 to -05:30:00. Magnitudes of the stellar objects in the area: above 11, up to 20. Desired FOV: 10x10 to 20x20 arcmin. Cadence: once/week. Duration: 12 months, or 52 weekly images. Filters: BVRI. Exposure: I leave it to be decided by the AAVSOnet team, depending on the optics and camera to be chosen. Motivation: • By monitoring the selected target I will be collaborating with the HOYS initiative (Hunting Outbursting Young Stars), to which I have been invited by its coordinator, Dr. Dirk Froebrich (University of Kent, Dublin, Ireland), and contributing data to the AAVSO photometric database. The HOYS citizen science project works with amateur astronomers on long-term photometric monitoring of nearby young stellar clusters and star-forming regions visible from the Northern Hemisphere to find any occasional stellar outbursting or other interesting objects for detailed follow-up and for the study of star and planet formation processes. • I will be learning about this young stellar object. I intend to join the YSO Section of the AAVSO along with the development of this project.

Targets
Target	RA (H.HH)	Dec (D.DD)	Magnitude	Telescope	Observation Frequency	Expiration Date	Proprietary Term
LDN 1641N	5.605278	-6.37000	10.0–20.0	MPO61	7	June 20, 2024	No

Comments

(4726) Kenneth Menzies — Dec. 23, 2023, 1:17 a.m.: Committed to mpo61.
(38172) Ari M. Siqueira — Jan. 15, 2024, 3:28 p.m.: I inform you that the images of the LDN 1641N cluster with the BVRI filters are good. The ones obtained with 300-s exposures resulted in excellent photometry of the fainter targets up to mag 19.
Therefore, please, take only 300-s exposed images from now on.
Thank you.
(38172) Ari M. Siqueira — Feb. 11, 2024, 1:52 a.m.: Hello,
On Jan 15, 2024, I asked that only 300-s exposures be taken for this project.
However, 30-s and 60-s exposures continued to be taken, unnecessarily increasing the AAVSOnet workload and taking me much longer to process the images, since I have to examine each image's metadata to be able to identify which ones are the 300-s ones, the ones that I need for the project.
Please, don't take short exposure images any longer, but just the 300-s ones.
Thank you.

Comments on this proposal are closed.