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Planetary Nebulae: Sources of Enlightenment
Henry, R. B. C.; Kwitter, Karen B.
In this review/tutorial we explore planetary nebulae as a stage in the evolution of low-to-intermediate-mass stars, as major contributors to the mass and chemical enrichment of the interstellar medium, and as astrophysical laboratories. We discuss many observed properties of planetary nebulae, placing particular emphasis on element abundance deter…
APERO: A PipelinE to Reduce Observations-Demonstration with SPIRou
Bouchy, François; Vandal, Thomas; Doyon, René +14 more
With the maturation of near-infrared high-resolution spectroscopy, especially when used for precision radial velocity, data reduction has faced unprecedented challenges in terms of how one goes from raw data to calibrated, extracted, and corrected data with required precisions of thousandths of a pixel. Here we present A PipelinE to Reduce Observa…
Low-cost Access to the Deep, High-cadence Sky: the Argus Optical Array
Law, Nicholas M.; Mann, Andrew W.; Corbett, Hank +16 more
New mass-produced, wide-field, small-aperture telescopes have the potential to revolutionize ground-based astronomy by greatly reducing the cost of collecting area. In this paper, we introduce a new class of large telescope based on these advances: an all-sky, arcsecond-resolution, 1000 telescope array which builds a simultaneously high-cadence an…
The Visual Survey Group: A Decade of Hunting Exoplanets and Unusual Stellar Events with Space-based Telescopes
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +9 more
This article presents the history of the Visual Survey Group (VSG)-a Professional-Amateur (Pro-Am) collaboration within the field of astronomy working on data from several space missions (Kepler, K2 and Transiting Exoplanet Survey Satellite). This paper covers the formation of the VSG, its survey-methods including the most common tools used and it…
Low Mass Stars as Tracers of Star and Cluster Formation
Megeath, S. T.; Gutermuth, R. A.; Kounkel, M. A.
We review the use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation. Observations of molecular clouds at visible, infrared, radio and X-ray wavelengths can identify and characterize the YSOs populating these clouds, with the ability to detect deeply embedded objects at all evolutionary stages. Su…
Citizen ASAS-SN Data Release. I. Variable Star Classification Using Citizen Science
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +7 more
We present the first results from Citizen ASAS-SN, a citizen science project for the All-Sky Automated Survey for Supernovae (ASAS-SN) hosted on the Zooniverse platform. Citizen ASAS-SN utilizes the newer, deeper, higher cadence ASAS-SN g-band data and tasks volunteers to classify periodic variable star candidates based on their phased light curve…
Automated Extended Aperture Photometry of K2 Variable Stars
Bódi, Attila; Szabó, Róbert; Molnár, László +2 more
Proper photometric data are challenging to obtain in the K2 mission of the Kepler space telescope due to strong systematics caused by the two-wheel-mode operation. It is especially true for variable stars wherein physical phenomena occur on timescales similar to the instrumental signals. We originally developed a method with the aim to extend the …
The Photometric Study of Six W UMa Systems and Investigation of the Mass-Radius Relations for Contact Binary Stars
Davoudi, Fatemeh; Poro, Atila; Paki, Ehsan +13 more
We present the photometric analysis of six short-period systems (EI Oct, V336 TrA, NX Boo, V356 Boo, PS Boo, and V2282 Cyg). This is the first photometric analysis of these systems except for V336 TrA. Observations were conducted for 27 nights at three observatories in the northern and southern hemispheres. We calculated a new ephemeris for each o…
A Deep Investigation of Two Poorly Studied Open Clusters Haffner 22 and Melotte 71 in the Gaia era
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +4 more
This paper presents a deep investigation of two open clusters, Haffner 22 and Melotte 71, using astrometric and photometric data from Gaia EDR3. We identified 382 and 597 most probable cluster members with membership probability higher than 50%. Mean proper motions in R.A. and decl. are estimated as (-1.631 ± 0.009, 2.889 ± 0.008) and (-2.398 ± 0.…
Digitization, Measurement, and Analysis of a 1905 Barnard Atlas Photographic Plate
Cerny, William; Kron, Richard G.; Martinez, Michael N. +7 more
In the second paper in this series, we improve on our previous demonstration of the ability of a commercially available graphic arts scanner and cost-effective analysis tools to produce scientifically useful scans of astronomical photographic plates. We describe a method using freely available tools to extract magnitude measurements from the star …