There was a call for pre-proposals in 2013, which was meant to provide an opportunity for combining similar programs. After review by IGRINS Korean TAC, two programs were pre-selected and awarded some of the LTP time. For those who plan to submit a similar or related proposals, we encourage you to communicate with the PIs of the pre-selected programs on potential co-proposals. If similar targets are proposed in different programs (e.g., young stellar objects for the studies of proto-planetary disks and outflows), observing time may be awarded only to the program of highest rank, or they may be asked to be merged. Therefore, for the potential proposals that may have similar targets of the pre-selected programs, it is best to coordinate with the pre-selected programs. This will promote more efficient use of the instrument time
coIs
Awarded time : 5 nights
We propose to observe standard stars with IGRINS to provide high quality of stellar spectral library in H and K bands, which can be used for various purposes. We selected targets mainly from the MK standard stars to cover all spectral types and luminosity classes. The full target list has not been finalized, but the targets should cover a wide range of grid in effective temperature and surface gravity as well as a wide range of metallicity. About half of our current targets have been observed with BOAO/BOES to make homogeneous optical spectra with the spectral resolution of 45,000, similar to that of IGRINS. Although early-type hot stars are almost feature-less in NIR, they can provide the reference spectra for evolved massive stars such as luminous blue variables (LBV) and be used as telluric standards. The observations of early-type stars can also provide important constraints to the telluric absorption models, which the Korean IGRINS team is developing. Therefore, we include 56 telluric reference sources. We pursue the high SNR of 250, which is especially required since the weakest lines in NIR can be used for oscillator strength determination as well as elemental abundance determinations. This program will be more profitable by the tight collaboration between Korean and UT scientists since Chris Sneden and Dan Jaffe have the same interest in this program, and they have the expertise for the analysis of high resolution spectra combined with the stellar atmospheric models.
We propose to observe disks in wide ranges of age, luminosity, and mass (from Class I to wTTSs, and from low-mass TTSs to Herbig Ae/Be stars and massive YSOs) with IGRINS. This program will provide a complete inventory of high resolution spectra of YSOs in various evolutionary stages and masses when combined with the UT YSO program led by Dan Jaffe. Most of our targets are from the Herschel Key Science Program, "Dust, Ice, and Gas in Time (DIGIT)" (Sturm et al. 2013), and most of them have been observed with the Spitzer IRS. Twelve embedded sources, including massive YSOs and low mass Class I sources (Bik et al. 2006; Connelley & Greene 2010), are also included. Therefore, we will be able to construct a consistent data set for the disk structure as a whole from < 1 AU to ~1000 AU in a range of mass. We also propose to observe FUors including HBC 722 to study the effect of heating by outburst on the physical and chemical structure in disks. The FUors in our target list were covered by the Herschel Program, "FU Orionis Objects Surveyed with Herschel (FOOSH)" (Green et al. 2013), and HBC 722 has been also observed with Hershel as a Target of Opportunity program (Green et al. 2012).