First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs

Rajpurohit, A. S.; Kumar, Vipin; Srivastava, Mudit; Allard, F.; Homeier, D.; Dixit, Vaibhav; Patel, Ankita

doi:10.1093/mnras/staa163

Cited by 13 publications

(6 citation statements)

References 42 publications

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“…We did not attempt to add these values in our list, since it would ask for a large work to get a consistent picture with other values found in the literature (e.g. Cifuentes et al, 2020;Rajpurohit et al, 2020;Mar l et al, 2021;Cristofari et al, 2022). As an illustration, we show in Fig.…”

Section: Astrophysical Parametersmentioning

confidence: 97%

The 10 parsec sample in the Gaia era: first update

Reyle,

Jardine,

Fouque

et al. 2023

Preprint

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The nearest stars provide a fundamental constraint for our understanding of stellar physics and the Galaxy. The nearby sample serves as an anchor where all objects can be studied and understood with precise data. This work is an update of the 10 pc sample published by Reylé et al. (2021) that used the unprecedented high precision parallax measurements from the early third data release of the astrometric space mission Gaia . We review this census, all updates being related to close binaries, brown dwarfs and exoplanets. We provide a new catalogue of 541 stars, brown dwarfs, and exoplanets in 336 systems within 10 pc from the Sun. This list is as volume-complete as possible from current knowledge and it provides a list of benchmark stars. We also explore the new products made available in the most recent third Gaia data release.

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Section: Astrophysical Parametersmentioning

confidence: 97%

The 10 parsec sample in the Gaia era: first update

Reyle,

Jardine,

Fouque

et al. 2023

Preprint

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“…Optical photometry and spectroscopy of V2891 Cyg were carried out with the Mount-Abu Faint Object Spectrograph and Camera-Pathfinder (MFOSC-P) instrument on the 1.2 m Mount Abu telescope (Srivastava et al 2018;Rajpurohit et al 2020;Srivastava et al 2021). The instrument provides seeing-limited imaging in the Bessell 𝐵𝑉𝑅𝐼 filters over a 5.2 × 5.2 arc-minute 2 field of view, with a sampling of 3.3 pixels per arc-second.…”

Section: Optical Observations From Mt Abumentioning

confidence: 99%

Optical and near-infrared spectroscopy of Nova V2891 Cygni: evidence for shock-induced dust formation

Kumar¹,

Srivastava

Banerjee

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present multi-epoch optical and near-infrared observations of the highly reddened, Fe ii class slow nova V2891 Cygni. The observations span 15 months since its discovery. The initial rapid brightening from quiescence, and the presence of a ∼35 day long pre-maximum halt, is well documented. The evidence that the current outburst of V2891 Cyg has undergone several distinct episodes of mass ejection is seen through time-varying P Cygni profiles of the O i 7773 Å line. A highlight is the occurrence of a dust formation event centred around ∼+273d, which coincides with a phase of coronal line emission. The dust mass is found to be ∼0.83 − 1.25 × 10−10 M⊙. There is strong evidence to suggest that the coronal lines are created by shock heating rather than by photoionization. The simultaneous occurrence of the dust and coronal lines (with varying velocity shifts) supports the possibility that dust formation is shock-induced. Such a route for dust formation has not previously been seen in a nova, although the mechanism has been proposed for dust formation in some core-collapse supernovae. Analysis of the coronal lines indicates a gas mass and temperature of 8.35–8.42 × 10−7 M⊙ and ∼(4.8 − 9.1) × 105 K respectively, and an overabundance of aluminium and silicon. A Case B analysis of the hydrogen lines yields a mass of the ionized gas of (8.60 ± 1.73) × 10−5 M⊙. The reddening and distance to the nova are estimated to be E(B − V) = 2.21 ± 0.15 and d = 5.50 kpc respectively.

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“…The derived values of effective temperature and surface gravity were in the range from 4000 K to 3000 K and 4.5 to 5.5 dex, respectively. This work has been published as a first science result from MFOSC-P (Rajpurohit et al, 2020).…”

Section: Spectroscopy Performancementioning

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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First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs

Cited by 13 publications

References 42 publications

The 10 parsec sample in the Gaia era: first update

The 10 parsec sample in the Gaia era: first update

Optical and near-infrared spectroscopy of Nova V2891 Cygni: evidence for shock-induced dust formation

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

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