# Investigating magnetic activity in very stable stellar magnetic fields: long-term photometric and spectroscopic study of the fully convective M4 dwarf V374 Peg

@article{Vida2016InvestigatingMA,
title={Investigating magnetic activity in very stable stellar magnetic fields: long-term photometric and spectroscopic study of the fully convective M4 dwarf V374 Peg},
author={Kriszti{\'a}n Vida and L. Kriskovics and Katalin Ol'ah and Martin Leitzinger and Petra Odert and Zs. KHov'ari and Heidi Korhonen and Robert Greimel and Russell M. Robb and B. Cs'ak and J. Kov'acs},
journal={arXiv: Solar and Stellar Astrophysics},
year={2016}
}
• Published 2 March 2016
• Physics
• arXiv: Solar and Stellar Astrophysics
The ultrafast-rotating ($P_\mathrm{rot}\approx0.44 d$) fully convective single M4 dwarf V374 Peg is a well-known laboratory for studying intense stellar activity in a stable magnetic topology. As an observable proxy for the stellar magnetic field, we study the stability of the light curve, and thus the spot configuration. We also measure the occurrence rate of flares and coronal mass ejections (CMEs). We analyse spectroscopic observations, $BV(RI)_C$ photometry covering 5 years, and additional…

## Figures and Tables from this paper

Giant white-light flares on fully convective stars occur at high latitudes
• Physics, Geology
Monthly Notices of the Royal Astronomical Society
• 2021
White-light flares are magnetically driven localized brightenings on the surfaces of stars. Their temporal, spectral, and statistical properties present a treasury of physical information about
Complex Rotational Modulation of Rapidly Rotating M Stars Observed with TESS
• Physics, Geology
The Astrophysical Journal
• 2019
We have searched for short periodicities in the light curves of stars with $T_{\rm eff}$ cooler than 4000 K made from 2-minute cadence data obtained in TESS sectors 1 and 2. Herein we report the
Magnetic cycles in a dynamo simulation of fully convective M-star Proxima Centauri
• Physics
• 2016
The recent discovery of an Earth-like exoplanet around Proxima Centauri has shined a spot light on slowly rotating fully convective M-stars. When such stars rotate rapidly (period $\lesssim 20$
Spots, Flares, Accretion, and Obscuration in the Pre-main-sequence Binary DQ Tau
• Physics, Geology
The Astrophysical Journal
• 2018
DQ Tau is a young low-mass spectroscopic binary, consisting of two almost equal-mass stars on a 15.8 d period surrounded by a circumbinary disk. Here, we analyze DQ Tau's light curves obtained by
Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ϵ Eridani
• Physics, Geology
The Astrophysical Journal
• 2022
We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of ϵ Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate
Suppression of Coronal Mass Ejections in Active Stars by an Overlying Large-scale Magnetic Field: A Numerical Study
• Physics
The Astrophysical Journal
• 2018
We present results from a set of numerical simulations aimed at exploring the mechanism of coronal mass ejection (CME) suppression in active stars by an overlying large-scale magnetic field. We use a
Orbiting Clouds of Material at the Keplerian Co-rotation Radius of Rapidly Rotating Low-mass WTTs in Upper Sco
• Physics, Geology
• 2017
Using K2 data, we identified 23 very-low-mass members of the ρ Oph and Upper Scorpius star-forming region as having periodic photometric variability not easily explained by well-established physical
TESS observations of southern ultrafast rotating low-mass stars
• Physics
• 2020
In our previous study of low mass stars using TESS, we found a handful which show a periodic modulation on a period <1 d but also displayed no flaring activity. Here we present the results of a
A stellar flare−coronal mass ejection event revealed by X-ray plasma motions
• Physics
Nature Astronomy
• 2019
Coronal mass ejections (CMEs), often associated with flares1–3, are the most powerful magnetic phenomena occurring on the Sun. Stars show magnetic activity levels up to ten thousand times higher4,
High-resolution spectroscopy of flares and CMEs on AD Leonis
• Physics, Geology
Astronomy & Astrophysics
• 2020
Context. Flares and coronal mass ejections (CMEs) are important for the evolution of the atmospheres of planets and their potential habitability, particularly for planets orbiting M stars at a

## References

SHOWING 1-10 OF 58 REFERENCES
The stable magnetic field of the fully convective star V374 Peg
• Physics
• 2008
We report in this paper phase-resolved spectropolarimetric observations of the rapidly rotating fully convective M4 dwarf V374 Peg, on which a strong, mainly axisymmetric, large-scale poloidal
DETECTING DIFFERENTIAL ROTATION AND STARSPOT EVOLUTION ON THE M DWARF GJ 1243 WITH KEPLER
• Physics, Geology
• 2015
We present an analysis of the starspots on the active M4 dwarf GJ 1243, using 4 years of time series photometry from Kepler. A rapid P = 0.592596 ? 0.00021 days rotation period is measured due to the
Photospheric and chromospheric activity in V405 Andromedae - An M dwarf binary with components on the two sides of the full convection limit
• Physics
• 2009
We investigate the fast-rotating (Porb = Prot = 0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)C and optical spectroscopic data. The light variation is caused by the combined
Powerful winds from low‐mass stars: V374 Peg
• Physics, Geology
• 2010
The M dwarf V374 Peg (M4) is believed to lie near the theoretical mass threshold for fully convective interiors. Its rapid rotation (P= 0.44 d) along with its intense magnetic field point towards
A search for flares and mass ejections on young late-type stars in the open cluster Blanco-1
• Physics
• 2014
We present a search for stellar activity (flares and mass ejections) in a sample of 28 stars in the young open cluster Blanco-1. We use optical spectra obtained with ESO's VIMOS multi-object
Kepler Flares I. Active and Inactive M dwarfs
• Physics
• 2014
We analyzed Kepler short-cadence M dwarf observations. Spectra from the ARC 3.5m telescope identify magnetically active (H$\alpha$ in emission) stars. The active stars are of mid-M spectral type,
Optical and X-ray studies of chromospherically active stars: FR Cancri, HD 95559 and LO Pegasi
• Physics
• 2005
We present a multiwavelength study of three chromospherically active stars, namely FR Cnc (= BD +16 ◦ 1753), HD 95559 and LO Peg (=BD +22 ◦ 4409), including newly obtained optical photometry,
Search for indications of stellar mass ejections using FUV spectra
• Physics
• 2011
Aims. We search for highly energetic activity phenomena in a small sample of late-type main-sequence stars in the far ultraviolet (FUV) using data from the Far Ultraviolet Spectroscopic Explorer
Photometric and spectroscopic observations of three rapidly rotating late-type stars: EY Dra, V374 Peg, and GSC 02038-00293†
• Physics
• 2010
a very rapidly rotating mid-K star. The Hline strength is variable, indicating changing chromosphe ric emission on GSC 02038-00293. In the case of EY Dra and V374 Peg, the stellar activity in the
Explaining the coexistence of large-scale and small-scale magnetic fields in fully convective stars
• Physics
• 2015
Despite the lack of a shear-rich tachocline region low-mass fully convective stars are capable of generating strong magnetic fields, indicating that a dynamo mechanism fundamentally different from