Design and development of Mt. Abu faint object spectrograph and camera-pathfinder (MFOSC-P) for PRL 1.2m Mt. Abu telescope, India

Srivastava, Mudit; Jangra, Mohanlal; Dixit, Vaibhav; Munjal, B. S.; Arora, Hemant; Mavani, Tejas

doi:10.1117/12.2309306

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…We used the MFOSC-P instrument (Srivastava et al, 2018(Srivastava et al, , 2021Rajpurohit et al, 2020) on PRL 1.2 m, f/13 telescope to observe our sample of M dwarfs (spectral region M0-M6.5). Because of the telescope's moderate aperture and combined telescope + instrument e ciency, we often limited our sample to V magnitudes brighter than 14.…”

Section: Sample Selection and Observationsmentioning

confidence: 99%

Exploring the short-term variability of Hα and H\b{eta} emissions in a sample of M Dwarfs

Kumar¹,

Rajpurohit²,

Srivastava³

2023

Preprint

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Activities in M dwarfs show spectroscopic variability over various time scales ranging from a few seconds to several hours. The time scales of such variability can be related to internal dynamics of M dwarfs like magnetic activity, energetic aring events, their rotation periods, etc. The time variability in the strengths of prominent emission lines (particularly Hα ) is mostly taken as a proxy of such dynamic behavior. In this study, we have performed the spectroscopic monitoring of 83 M dwarfs (M0-M6.5) to study the variations in Hα and Hβ emissions on short-time scales. Low-resolution (resolution ∼5.7 angstroms) spectral time series of 3-5 minutes cadence over 0.7-2.3 hours were obtained with MFOSC-P instrument on PRL 1.2m Mt. Abu telescope, covering Hβ and Hα wavelengths. Coupled with the data available in the literature and archival photometric data from TESS and Kepler/K2 archives, various variability parameters are explored for any plausible systematics with respect to their spectral types, and rotation periods. Though about 64% of our sample shows statistically signi cant variability, it is not uniform across the spectral type and rotation period. Hα activity strength (LHα/L bol ) is also derived and explored for such distributions.

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Section: Sample Selection and Observationsmentioning

confidence: 99%

Exploring the short-term variability of Hα and H\b{eta} emissions in a sample of M Dwarfs

Kumar¹,

Rajpurohit²,

Srivastava³

2023

Preprint

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“…were performed to ensure compliance with the specified design requirements. The details of structural analysis are described in Srivastava et al (2018).…”

Section: Glass Windowmentioning

confidence: 99%

Design and Development of Mt. Abu Faint Object Spectrograph and Camera -- Pathfinder (MFOSC-P) for PRL 1.2m Mt. Abu Telescope

Srivastava,

Kumar,

Dixit

et al. 2021

Preprint

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Mt. Abu Faint Object Spectrograph and Camera -Pathfinder (MFOSC-P) is an imager-spectrograph developed for the Physical Research Laboratory (PRL) 1.2m telescope at Gurushikhar, Mt. Abu, India. MFOSC-P is based on a focal reducer concept and provides seeing limited imaging (with a sampling of 3.3 pixels per arc-second) in Bessell's B, V, R, I and narrowband H-α filters. The instrument uses three plane reflection gratings, covering the spectral range of 4500-8500 Å, with three different resolutions of 500, 1000, and 2000 around their central wavelengths. MFOSC-P was conceived as a pathfinder instrument for a next-generation instrument on the PRL's 2.5m telescope which is coming up at Mt. Abu. The instrument was developed during 2015-2019 and successfully commissioned on the PRL 1.2m telescope in February 2019. The designed performance has been verified with laboratory characterization tests and on-sky commissioning observations. Different science programs covering a range of objects are being executed with MFOSC-P since then, e.g., spectroscopy of M-dwarfs, novae & symbiotic systems, and detection of H-α emission in star-forming regions. MFOSC-P presents a novel design and cost-effective way to develop a FOSC (Faint Object Spectrograph and Camera) type of instrument on a shorter time-scale of development. The design and development methodology presented here is most suitable in helping the small aperture telescope community develop such a versatile instrument, thereby diversifying the science programs of such observatories.

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“…Abu Faint Object Spectrograph and Camera -Pathfinder (MFOSC-P) mounted on the Physical Research Laboratory (PRL) 1.2m telescope at Mt. Abu India (Srivastava et al 2018(Srivastava et al , 2021. For our observations we used the grating with 150 lines per mm which gives a resolution of ∆λ/λ ∼ 500.…”

Section: Spectroscopic Monitoringmentioning

confidence: 99%

The Flare-Activity of 2MASSJ16111534-1757214 in the Upper Scorpius association

Guenther,

Woeckel,

Chaturvedi

et al. 2021

Preprint

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Flares are known to play an important role for the evolution of the atmospheres of young planets. In order to understand the evolution of planets, it is thus important to study the flare-activity of young stars. This is particularly the case for young Mstars, because they are very active. We study photometrically and spectroscopically the highly active M-star 2MASS J16111534-1757214. We show that it is a member of the Upper Sco OB association, which has an age of 5-10 Myrs. We also re-evaluate the status of other bona-fide M-stars in this region and identify 42 members. Analyzing the K2-light curves, we find that 2MASS J16111534-1757214 has, on average, one superflare with E ≥ 10 35 erg every 620 hours, and one with E ≥ 10 34 erg every 52 hours. Although this is the most active M-star in the Upper Sco association, the powerlaw index of its flare-distribution is similar to that of other M-stars in this region. 2MASS J16111534-1757214 as well as other M-stars in this region show a broken powerlaw distribution in the flare-frequency diagram. Flares larger than E ≥ 3 10 34 erg have a power-law index β = −1.3 ± 0.1 and flares smaller than that β = −0.8 ± 0.1. We furthermore conclude that the flare-energy distribution for young M-stars is not that different from solar-like stars.

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Design and development of Mt. Abu faint object spectrograph and camera-pathfinder (MFOSC-P) for PRL 1.2m Mt. Abu telescope, India

Cited by 7 publications

References 8 publications

Exploring the short-term variability of Hα and H\b{eta} emissions in a sample of M Dwarfs

Exploring the short-term variability of Hα and H\b{eta} emissions in a sample of M Dwarfs

Design and Development of Mt. Abu Faint Object Spectrograph and Camera -- Pathfinder (MFOSC-P) for PRL 1.2m Mt. Abu Telescope

The Flare-Activity of 2MASSJ16111534-1757214 in the Upper Scorpius association

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