DeGaPe 35: Amateur discovery of a new southern symbiotic star

Petit, Thomas; Merc, Jaroslav; Gális, R.; Charbonnel, S.; Demange, Thierry; Galli, Richard A.; Garde, O.; Dû, Pascal Le; Mulato, Lionel

doi:10.1016/j.newast.2022.101943

Cited by 6 publications

(2 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the comparison of these theoretical predictions with the most recent census of known SySts in the Milky Way (Akras et al 2019a;Merc et al 2019, and references therein) and the latest discoveries over the past few years (Merc et al 2020;Akras et al 2021;Merc et al 2021bMerc et al ,a, 2022Munari et al 2021Munari et al , 2022De et al 2022;Petit et al 2023), it is evident that many Galactic SySts are still missing and waiting to be discovered. Thus far, the vast majority of the known SySts if not all of them, have been discovered and identified following a number of criteria based on optical observations: (i) the detection of some typical emission lines (e.g., [Fe ] λ λ 5727,6087), Hα, [O ]λ 5007, and He λ 4686, (ii) the absorption molecular features such a TiO, VO, and CN that ensure the presence of a red giant, and/or (iii) the detection of the O Ramanscattered λ λ 6830,7088 lines (Mikolajewska et al 1997;Belczyński et al 2000;Akras et al 2019a).…”

Section: Introductionmentioning

confidence: 91%

Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues

Akras

2023

Preprint

View full text Add to dashboard Cite

Theoretical predictions of the population of Galactic symbiotic stars (SySts) are highly inconsistent with the current known population. Despite intense effort over the past decades, observations are still far below the predictions. The majority of known SySts so far are identified based on selection criteria established in the optical regime. The recent discovery of SU Lyn with very faint optical emission lines uncloaked a subgroup of SySts with accreting-only white dwarfs. In this particular case, the luminous red giant may overshadow the dimmed white dwarf companion. A new approach to search for this subgroup of SySts is presented, employing GALEX UV and 2MASS/AllWISE IR photometry. The FUV-NUV colour index is an indicator, direct or indirect, for the presence of hot compact companions. The cross-match of the Catalogue of Variable Stars III obtained from the All-Sky Automated Survey for Super-Novae with the GALEX, 2MASS and AllWISE catalogues result in a sample of 814 potential SySt candidates. From them, 105 sources have photometric measurements from both FUV and NUV bands and 35 exhibit FUV-NUV<1, similar to what it is expected from known SySts. Five known SySts are recovered, while two new genuine SySts are discovered in spectroscopic follow-up observations after the detection of the typical emission lines.

show abstract

Section: Introductionmentioning

confidence: 91%

Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues

Akras

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…By the end of this decade, 209 galactic planetary nebulae had been discovered by a group of French amateur astronomers in collaboration with professional astronomers, adding significantly to the planetary nebula database [1]. In addition, there are several papers that discuss the role of amateur astronomers and the general public in the development of astronomy [2][3][4][5]. The growing contribution of amateur astronomers in astronomy must be in line with the equipment that supports research in astronomy.…”

Section: Introductionmentioning

confidence: 99%

Developing and Testing a Cooling System for CMOS in DSLR to Minimize Noise in Astronomical Image and Incorporating a Sky Quality Meter

Syahputra,

Nuryanto,

Iskak

2024

Preprint

View full text Add to dashboard Cite

To capture faint astronomical images effectively, commercial camera like Digital Single-lens reflects (DSLR) require operation at low temperatures to minimize dark current noise. To achieve this, a cooling system utilizing Thermoelectric Cooler (TEC) technology is devised. This cooling apparatus is regulated by a microcontroller employing digital PID control. The design process for the cooler and its fan is conducted via computational fluid dynamics (CFD) simulations. Real-time temperature data is acquired using a temperature sensor affixed to the rear of the camera sensor. This data serves as input for the digital PID control algorithm, with the calculated PID results then applied to the PWM controller linked to the TEC. Consequently, the camera sensor temperature is effectively lowered in accordance with the specified target temperature. Apart from that, a sky quality meter is also installed on the device to measure the brightness of the night sky. By integrating the sky quality meter with the DSLR, researchers can obtain additional data in the form of sky brightness, which will be very useful in analyzing and interpreting astronomical images. In this paper, a DSLR camera cooling system integrated with a sky quality meter will be designed, tested and discussed in detail.

show abstract

Symbiotic stars, weird novae, and related embarrassing binaries

Merc,

Mikołajewska

2024

Nat Astron

View full text Add to dashboard Cite

DeGaPe 35: Amateur discovery of a new southern symbiotic star

Cited by 6 publications

References 49 publications

Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues

Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues

Developing and Testing a Cooling System for CMOS in DSLR to Minimize Noise in Astronomical Image and Incorporating a Sky Quality Meter

Symbiotic stars, weird novae, and related embarrassing binaries

Contact Info

Product

Resources

About