Field Sampling and Analytical Intercomparison for Mercury and Methylmercury Determination in Natural Water

Lépine, Louis; Chamberland, A.

doi:10.1007/978-94-011-0153-0_142

Cited by 12 publications

(15 citation statements)

References 16 publications

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“…We identify nearby M dwarfs in a color-magnitude diagram, following the procedure outlined in Lépine (2005). We restrict the search to the northern sky, where the SU-PERBLINK survey is complete.…”

Section: Identification Of Nearby M Dwarfsmentioning

confidence: 99%

The northern census of M dwarfs within 100 pc, and its potential for exoplanet surveys

Lépine¹,

Gaidos²

2013

Astron Nachr

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We present a new census of ∼100 000 M dwarfs located within 100 pc of the Sun, identified in the SUPERBLINK proper motion survey. We show the new census to be > 95 % complete to 50 pc, and > 70 % complete to 100 pc. We discuss various subsamples which should be considered high-priority targets for exoplanet surveys. These include: (1) very bright M dwarfs amenable to high-precision radial velocity surveys, (2) young M dwarfs making promising targets for direct/coronagraphic imaging programs, and (3) late-type M dwarfs with small radii, which have strong potential for the detection of Earth-mass planets in transit surveys. We show that all three subsamples are well-represented in the census, and discuss magnitude and color ranges of possible targets, and additional observations which may be required to validate the targets for exoplanet surveys and filter out possible contaminants. We present results from an ongoing followup program, which has so far gathered low-resolution optical spectra for ∼ 8 000 M dwarfs (including all within 20 pc, and those brighter than J = 9 mag), and already provides formal spectral classification and metallicity estimates for a significant number of high-priority targets.

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Section: Identification Of Nearby M Dwarfsmentioning

confidence: 99%

The northern census of M dwarfs within 100 pc, and its potential for exoplanet surveys

Lépine¹,

Gaidos²

2013

Astron Nachr

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“…The recent trigonometric parallax measurement of π = 44.9 ± 2.0 mas (or d = 22.3 ± 1.0 pc) from Lépine et al (2009) confirms the low surface gravity of the object: assuming T eff = 5000 K and an absolute magnitude of M V = 14.3 ± 0.1, we obtain a low surface gravity of log g = 7.4 ± 0.1. PM J11480−4523 was selected from the sample of high propermotion stars of Lépine (2005).…”

Section: Overlap With Other Catalogues or Surveysmentioning

confidence: 99%

A study of high proper-motion white dwarfs - I. Spectropolarimetry of a cool hydrogen-rich sample

Kawka

Vennes

2012

Monthly Notices of the Royal Astronomical Society

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We conducted a spectropolarimetic survey of 58 high proper‐motion white dwarfs which achieved uncertainties of >rsim 2 kG in the Hα line and >rsim 5 kG in the upper Balmer line series. The survey aimed at detecting low magnetic fields (≲ 100 kG) and helped identify the new magnetic white dwarfs NLTT 2219, with a longitudinal field Bl = −97 kG, and NLTT 10480 (Bl = −212 kG). Furthermore, we report the possible identification of a very low‐field white dwarf with Bl = −4.6 kG. The observations show that ≈5 per cent of white dwarfs harbour low fields (∼10 to ∼102 kG) and that increased survey sensitivity may help uncover several new magnetic white dwarfs with fields below ∼1 kG. A series of observations of the high‐field white dwarf NLTT 12758 revealed changes in polarity occurring within an hour possibly associated with an inclined, fast rotating dipole. Also, the relative strength of the π and σ components in NLTT 12758 possibly revealed the effect of a field concentration (‘spot’), or, most likely, the presence of a non‐magnetic white dwarf companion. Similar observations of NLTT 13015 also showed possible polarity variations, but without a clear indication of the time‐scale. The survey data also proved useful in constraining the chemical composition, age and kinematics of a sample of cool white dwarfs as well as in constraining the incidence of double degenerates.

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“…These surveys, which subsequently formed the basis for most work on nearby stars, are strongly biased against the inclusion of southern hemisphere stars, and to this day there are still possibilities to find new, relatively bright, nearby stars in the south (e.g. Hambly et al 2004;Lépine 2005).…”

Section: A Census Of the Solar Neighbourhoodmentioning

confidence: 99%

“…In the 1990s the Palomar Michigan State University (PMSU) survey conducted extensive spectroscopic investigations of CNS3, refining it and defining complete samples to magnitude-dependent distance limits (Reid et al 1995;Hawley et al 1996;Gizis et al 2002). Throughout the last decade efforts have focused on (i) pushing these limits further outward for faint low-mass stars using the NLTT/2MASS catalogues and spectroscopy (Reid et al 2004;Cruz et al 2007); (ii) using reanalyses of older plate material to increase completeness (Lépine et al 2003;Lépine 2005); and (iii) establishing better trigonometric parallax data for the very nearest objects (Henry et al 2006). It is now likely that for stars, the sample is complete to 8 pc in the northern hemisphere, with further work to do in the south; is rapidly becoming complete to 10 pc; and is about 80 per cent complete to 20 pc ).…”

Section: A Census Of the Solar Neighbourhoodmentioning

confidence: 99%

Measuring the Initial Mass Function of Low Mass Stars and Brown Dwarfs

Jeffries

2012

EAS Publications Series

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I review efforts to determine the form and any lower limit to the initial mass function in the Galactic disk, using observations of low-mass stars and brown dwarfs in the field, young clusters and star forming regions. I focus on the methodologies that have been used and the uncertainties that exist due to observational limitations and to systematic uncertainties in calibrations and theoretical models. I conclude that whilst it is possible that the low-mass IMFs deduced from the field and most young clusters are similar, there are too many problems to be sure; there are examples of low-mass cluster IMFs that appear to be very discrepant and the IMFs for brown dwarfs in the field and young clusters have yet to be reconciled convincingly.

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Field Sampling and Analytical Intercomparison for Mercury and Methylmercury Determination in Natural Water

Cited by 12 publications

References 16 publications

The northern census of M dwarfs within 100 pc, and its potential for exoplanet surveys

The northern census of M dwarfs within 100 pc, and its potential for exoplanet surveys

A study of high proper-motion white dwarfs - I. Spectropolarimetry of a cool hydrogen-rich sample

Measuring the Initial Mass Function of Low Mass Stars and Brown Dwarfs

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