Design and development of the fibre cable and fore optics of the HERMES Spectrograph for the Anglo-Australian Telescope (AAT)

Brzeski, Jurek; Case, Scott W.; Gers, Luke

doi:10.1117/12.896389

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…It is then dispersed using volume phase holographic diffraction gratings and imaged by four independently controlled cameras. Further details of instrument design, and its as-built performance, can be found in Barden et al (2010), Brzeski et al (2011), Heijmans et al (2012), Farrell et al (2014 and Sheinis et al (2015).…”

Section: Observationsmentioning

confidence: 99%

The GALAH Survey: second data release

Buder

Asplund

Duong

et al. 2018

Monthly Notices of the Royal Astronomical Society

370

447

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The Galactic Archaeology with HERMES (GALAH) survey is a large-scale stellar spectroscopic survey of the Milky Way and designed to deliver chemical information complementary to a large number of stars covered by the Gaia mission. We present the GALAH second public data release (GALAH DR2) containing 342,682 stars. For these stars, the GALAH collaboration provides stellar parameters and abundances for up to 23 elements to the community. Here we present the target selection, observation, data reduction and detailed explanation of how the spectra were analysed to estimate stellar parameters and element abundances. For the stellar analysis, we have used a multi-step approach. We use the physics-driven spectrum synthesis of Spectroscopy Made Easy (SME) to derive stellar labels (T eff , log g, [Fe/H], [X/Fe], v mic , v sin i, A K S ) for a representative training set of stars. This information is then propagated to the whole survey with the data-driven method of The Cannon. Special care has been exercised in the spectral synthesis to only consider spectral lines that have reliable atomic input data and are little affected by blending lines. Departures from local thermodynamic equilibrium (LTE) are considered for several key elements, including Li, O, Na, Mg, Al, Si, and Fe, using 1D stellar atmosphere models. Validation tests including repeat observations, Gaia benchmark stars, open and globular clusters, and K2 asteroseismic targets lend confidence to our methods and results. Combining the GALAH DR2 catalogue with the kinematic information from Gaia will enable a wide range of Galactic Archaeology studies, with unprecedented detail, dimensionality, and scope.

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Section: Observationsmentioning

confidence: 99%

The GALAH Survey: second data release

Buder

Asplund

Duong

et al. 2018

Monthly Notices of the Royal Astronomical Society

370

447

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“…The observations were obtained with the 4-m AAT located at Siding Spring Observatory in Australia. We use the High Efficiency and Resolution Multi-Element Spectrograph (HERMES), which can obtain spectra of up to 360 science targets simultaneously (Sheinis et al 2015;Heijmans et al 2012;Brzeski et al 2011;Barden et al 2010).…”

Section: Introductionmentioning

confidence: 99%

The TESS–HERMES survey data release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone

Sharma

Stello

Buder

et al. 2017

Monthly Notices of the Royal Astronomical Society

149

125

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The Transiting Exoplanet Survey Satellite (TESS) will provide high precision time-series photometry for millions of stars with at least a half-hour cadence. Of particular interest are the circular regions of 12-degree radius centered around the ecliptic poles that will be observed continuously for a full year. Spectroscopic stellar parameters are desirable to characterize and select suitable targets for TESS, whether they are focused on exploring exoplanets, stellar astrophysics, or Galactic archaeology. Here, we present spectroscopic stellar parameters (T eff , log g, [Fe/H], v sin i, v micro ) for about 16,000 dwarf and subgiant stars in TESS' southern continuous viewing zone. For almost all the stars, we also present Bayesian estimates of stellar properties including distance, extinction, mass, radius, and age using theoretical isochrones. Stellar surface gravity and radius are made available for an additional set of roughly 8,500 red giants. All our target stars are in the range 10 < V < 13.1. Among them, we identify and list 227 stars belonging to the Large Magellanic Cloud. The data were taken using the the High Efficiency and Resolution Multi-Element Spectrograph (HERMES, R ∼ 28, 000) at the Anglo-Australian Telescope as part of the TESS-HERMES survey. Comparing our results with the TESS Input Catalog (TIC) shows that the TIC is generally efficient in separating dwarfs and giants, but it has flagged more than hundred cool dwarfs (T eff < 4800 K) as giants, which ought to be high-priority targets for the exoplanet search. The catalog can be accessed via http://www.physics.usyd.edu.au/tess-hermes/, or at MAST.

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“…The instrumental requirements for efficiency, wavelength range and spectral resolution were therefore focused on producing spectra rich in information about stellar parameters and chemical abundances, across a wide range of stellar effective temperature, surface gravity and overall metallicity. Details of HERMES design and integration can be found in Barden et al (2010), Brzeski et al (2011), Heijmans et al (2012) and Farrell et al (2014), and the as-built performance is discussed in Sheinis et al (2015).…”

Section: Instrumentation: the Hermes Spectrograph And The 2df Fibre Pmentioning

confidence: 99%