SkyMapper Southern Survey: First Data Release (DR1)

Wolf, Christian; Onken, Christopher A.; Luvaul, Lance; Schmidt, B. P.; Bessell, M. S.; Chang, Seo-Won; Costa, G. S. Da; Mackey, A. D.; Martin-Jones, Tony; Murphy, Simon J.; Preston, T.; Scalzo, R.; Shao, Li; Smillie, Jon; Tisserand, Patrick; White, Marc; Yuan, F.

doi:10.1017/pasa.2018.5

Cited by 389 publications

(227 citation statements)

References 62 publications

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“…After pattern-noise removal, the standard deviation of the values of the pixels in this image is ∼7 counts. This spread agrees with the range of readout noises reported for the SkyMapper readout amplifiers inWolf et al (2018).…”

supporting

confidence: 88%

“…We developed a data reduction pipeline for these data separately from the one used by the SkyMapper collaboration (Wolf et al 2018), since no pipeline existed when the data for this project were collected in late 2015. The reduction procedure for SkyMapper data is not trivial due to the presence of systematic pattern-noise signatures in the raw data that, if not properly removed, would impair any photometric measurements, as can be seen in Figure 1.…”

Section: Photometrymentioning

confidence: 99%

“…We opted not to use magnitudes derived from fitting a point spread function (PSF) of the images as the PSF appeared to not be stable over the full field of view of the SkyMapper images. Our final source catalogs were de-reddening following Wolf et al (2018), based on reddening maps from Schlegel et al (1998). An additional zero-point correction was applied to the u and v magnitudes following equations 4 and 5 in Casagrande et al (2019) to account for a reddening overcorrection for sources close to the Galactic plane.…”

Section: Data Reductionmentioning

confidence: 99%

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Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

Chiti¹,

Frebel²,

Jerjen

et al. 2020

ApJ

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We present a study of the ultra-faint Milky Way dwarf satellite galaxy Tucana II using deep photometry from the 1.3 m SkyMapper telescope at Siding Spring Observatory, Australia. The SkyMapper filter-set contains a metallicity-sensitive intermediate-band v filter covering the prominent Ca II K feature at 3933.7Å. When combined with photometry from the SkyMapper u, g, and i filters, we demonstrate that v band photometry can be used to obtain stellar metallicities with a precision of ∼ 0.20 dex when [Fe/H] > −2.5, and ∼ 0.34 dex when [Fe/H] < −2.5. Since the u and v filters bracket the Balmer Jump at 3646Å, we also find that the filter-set can be used to derive surface gravities. We thus derive photometric metallicities and surface gravities for all stars down to a magnitude of g ∼ 20 within ∼75 arcminutes of Tucana II. Photometric metallicity and surface gravity cuts remove nearly all foreground contamination. By incorporating Gaia proper motions, we derive quantitative membership probabilities which recover all known members on the red giant branch of Tucana II. Additionally, we identify multiple likely new members in the center of the system and candidate members several half-light radii from the center of the system. Finally, we present a metallicity distribution function derived from the photometric metallicities of likely Tucana II members. This result demonstrates the utility of wide-field imaging with the SkyMapper filter-set in studying UFDs, and in general, low surface brightness populations of metal-poor stars. Upcoming work will clarify the membership status of several distant stars identified as candidate members of Tucana II.

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supporting

confidence: 88%

Section: Photometrymentioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

See 1 more Smart Citation

Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

Chiti¹,

Frebel²,

Jerjen

et al. 2020

ApJ

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“…We now go on to discuss the various steps which were taken to eliminate any sources which were not main sequence solar-type stars. Firstly, the sources were cross referenced with the SkyMapper Southern Sky Survey (Wolf et al 2018) and Gaia DR2 (Gaia Collaboration 2018). Any star which did not possess SkyMapper magnitudes or Gaia parallaxes was not considered any further.…”

Section: Solar-type Star Samplementioning

confidence: 99%

Superflares and variability in solar-type stars with TESS in the Southern hemisphere

Doyle

Ramsay

Doyle

2020

Monthly Notices of the Royal Astronomical Society

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Superflares on solar-type stars has been a rapidly developing field ever since the launch of Kepler. Over the years, there have been several studies investigating the statistics of these explosive events. In this study, we present a statistical analysis of stellar flares on solar-type stars made using photometric data in 2-min cadence from TESS of the whole southern hemisphere (sectors 1 -13). We derive rotational periods for all stars in our sample from rotational modulations present in the lightcurve as a result of large starspot(s) on the surface. We identify 1980 stellar flares from 209 solar-type stars with energies in the range of 10 31 − 10 36 erg (using the solar flare classification, this corresponds to X1 -X100,000) and conduct an analysis into their properties. We investigate the rotational phase of the flares and find no preference for any phase suggesting the flares are randomly distributed. As a benchmark, we use GOES data of solar flares to detail the close relationship between solar flares and sunspots. In addition, we also calculate approximate spot areas for each of our stars and compare this to flare number, rotational phase and flare energy. Additionally, two of our stars were observed in the continuous viewing zone with lightcurves spanning one year, as a result we examine the stellar variability of these stars in more detail.

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“…The current SkyMapper (Wolf et al 2018) and Gaia (Gaia Collaboration et al 2018) surveys provide a means of identifying different populations, especially Carbon Stars in the Magellanic Clouds, with essentially minimal contamination, thus facilitating a detailed kinematic portrait of the LMC and enabling comparisons of different populations within same context. As detailed in the following sections, the SkyMapper photometric system is ideally suited to iden-tifying the Carbon Star population of the LMC; as luminous intermediate-age stars distinguishable by their broad carbon absorption, they represent excellent tracers of the structure and kinematics of the LMC.…”

Section: Introductionmentioning

confidence: 99%

A SkyMapper view of the Large Magellanic Cloud: the dynamics of stellar populations

Wan

Guglielmo

Lewis

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present the first SkyMapper stellar population analysis of the Large Magellanic Cloud (hereafter LMC),including the identification of 3578 candidate Carbon Stars through their extremely red g − r colours. Coupled with Gaia astrometry, we analyse the distribution and kinematics of this Carbon Star population, finding the LMC to be centred at (R.A., Dec.) = (80.90 • ±0.29, −68.74 • ±0.12), with a bulk proper motion of (µ α , µ δ ) = (1.878 ± 0.007, 0.293 ± 0.018) mas yr −1 and a disk inclination of i = 25.6 • ± 1.1 at position angle θ = 135.6 • ± 3.3 • . We complement this study with the identification and analysis of additional stellar populations, finding that the dynamical centre for Red Giant Branch (RGB) stars is similar to that seen for the Carbon Stars, whereas for young stars the dynamical centre is significantly offset from the older populations. This potentially indicates that the young stars were formed as a consequence of a strong tidal interaction, probably with the Small Magellanic Cloud (SMC). In terms of internal dynamics, the tangential velocity profile increases linearly within ∼ 3 kpc, after which it maintains an approximately constant value of V rot = 83.6 ± 1.7 km s −1 until ∼ 7 kpc. With an asymmetric drift correction, we estimate the mass within 7 kpc to be M LMC (< 7 kpc) = (2.5±0.1)×10 10 M and within the tidal radius (∼ 30 kpc) to be M LMC (< 30 kpc) = (1.06 ± 0.32) × 10 11 M , consistent with other recent measurements.

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SkyMapper Southern Survey: First Data Release (DR1)

Cited by 389 publications

References 62 publications

Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

Superflares and variability in solar-type stars with TESS in the Southern hemisphere

A SkyMapper view of the Large Magellanic Cloud: the dynamics of stellar populations

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